Another Grever composition would make an even more remarkable journey. In 1934, she wrote the Spanish-language song “Cuando vuelva a tu lado.” Jewish American lyricist Stanley Adams subsequently created new English words for its melody, producing “What a Diff’rence a Day Made,” now generally known as “What a Diff’rence a Day Makes.”

In 1959, eight years after Grever’s death, the great African American singer Dinah Washington recorded the version that made the song internationally unforgettable. It reached number eight on the Billboard Hot 100, won the Grammy Award for Best Rhythm and Blues Performance and was later inducted into the Grammy Hall of Fame. A melody by a Mexican woman, new words by an American Jewish lyricist and the voice of an African American performer became part of the shared musical memory of Black and white America.

This cultural journey was not organized by a foreign ministry and required no treaty or political campaign. It was cultural diplomacy in its most natural form: people of different backgrounds contributing to something beautiful and sharing it across the boundaries of language, nationality and race.

The song did not ask Americans to debate segregation. It gave them the same voice to admire, the same melody to enjoy and the same emotions to recognize. It brought people closer through pleasure rather than confrontation.

This is the central argument of the story that follows: political struggle changed the laws of segregation; shared culture helped reduce the emotional distance that had made segregation possible.

When Music Crossed the Color Line

The struggle for African American equality was advanced through extraordinary political courage: civil-rights organizations, Black churches, legal challenges, demonstrations, voter-registration campaigns and the sacrifices of countless citizens. Popular music could not replace that work, but it made an important cultural contribution.

Segregation separated Americans in schools, restaurants, hotels, neighbourhoods and public facilities. Music proved far more difficult to contain. Records entered private homes, radio signals crossed geographic and social boundaries, and young people discovered sounds that established institutions had often excluded from mainstream culture.

African American performers became the voices through which white listeners experienced romance, excitement, elegance, humour and happiness. Repeated listening created familiarity; familiarity made admiration possible; admiration encouraged identification. White listeners increasingly recognized their own feelings and aspirations in Black voices.

This did not automatically remove prejudice. But it weakened the assumption that Black and white Americans inhabited entirely separate human worlds. It became harder to defend the fiction of racial inferiority when African American artists were creating some of the nation’s most admired music.

Five recordings illustrate different stages of that cultural transformation.

Nat King Cole: Dignity and Representation

Nat King Cole’s 1951 recording of “Unforgettable” carried his warmth, elegance and romantic sensitivity into homes across America. His success challenged degrading racial stereotypes by presenting a Black man as sophisticated, dignified and central to American cultural life.

Cole’s popularity eventually brought him to national television as the host of The Nat King Cole Show. Yet he continued to face severe racism. He was attacked by white supremacists during a 1956 concert in Birmingham, Alabama, and his television programme struggled to secure national sponsorship.

The contradiction was revealing: white America welcomed Cole’s voice more readily than it accepted his equality. Nevertheless, his presence in millions of homes expanded the representation of African Americans in mainstream culture and demonstrated how deeply Black talent already belonged to the nation.

Fats Domino: Shared Youthful Joy

Fats Domino’s 1956 recording of “Blueberry Hill” became one of the defining songs of early rock and roll. Black and white teenagers bought the record and danced to the same rhythm, even while many of their schools and communities remained segregated.

Domino did not ask white listeners to appreciate him as a political duty. They wanted his music because it brought them happiness. That genuine enjoyment mattered. Formal tolerance can remain distant, but affection creates a personal relationship.

Through songs such as “Blueberry Hill,” popular music gave young Black and white Americans an experience they could share. The social order might classify them as separate, but the music was already creating a common generation.

Chuck Berry: A Common Language of Aspiration

Released in 1958, Chuck Berry’s “Johnny B. Goode” told the story of a gifted young guitarist dreaming that his talent might one day make him famous. Teenagers across America could identify with its themes of ambition, recognition and freedom.

Berry combined elements of rhythm and blues and country music to help create a new American musical language. He did not ask white listeners merely to sympathize with an African American protagonist. He invited them to recognize themselves in the young musician’s aspirations.

Identification can reach further than sympathy. It replaces the distant “other” with a recognizable version of oneself. Berry’s profound influence on generations of Black and white performers also demonstrated that African American creativity was not peripheral to American culture; it was one of its foundations.

Sam Cooke: Emotional Identification

Sam Cooke’s “You Send Me” reached number one on both the principal Billboard pop and rhythm-and-blues charts in 1957. Its tenderness and vulnerability gave Cooke an audience crossing divisions of race, age and gender.

White listeners encountered Cooke not initially as the representative of a political cause, but as the voice accompanying their own romances and memories. That emotional relationship later gave additional resonance to “A Change Is Gonna Come.”

Cooke first established common ground through songs of love and happiness. When he eventually addressed racial suffering and hope more directly, he spoke to an audience that already knew and admired him. His career demonstrated how uniting music can prepare listeners to hear more difficult truths.

The Supremes: At the Centre of American Culture

In 1964, the Supremes reached number one with “Where Did Our Love Go,” the first of five consecutive American chart-toppers. Three young Black women from Detroit became international figures of talent, elegance and modernity.

Their success placed African American women at the centre of mainstream popular culture. Audiences did not embrace the Supremes out of civic obligation; they loved their music. Through that affection, Black artists became increasingly inseparable from America’s understanding of itself.

The same year, the Civil Rights Act became law. The Supremes did not create that legislation, and their achievement should never be confused with the sacrifices that produced political change. But they helped make another kind of America culturally imaginable: one in which African American artists did not merely participate in national culture but helped define it.

The Paradox of Cultural Affection

The history should not be romanticized. Loving Black music did not necessarily mean respecting Black people.

African American musicians could entertain white audiences while being refused accommodation in the same hotels where those audiences stayed. Black artists could achieve commercial success while facing discriminatory contracts, segregated venues and racist violence. White performers and record companies sometimes received greater promotion and financial rewards from music originating in African American communities.

White America could purchase Black records while preserving racial segregation. Cultural affection did not automatically produce political equality.

Yet it created a contradiction that became increasingly difficult to defend: how could a society celebrate African American voices while denying African American citizens equal dignity?

The contribution of popular music was therefore neither sufficient nor insignificant. Political organization, protest and legislation confronted injustice directly. Popular culture worked upon the emotional conditions surrounding that struggle.

It reduced social distance. It produced admiration. It normalized Black visibility. It created identification and shared memories. It demonstrated that African American creativity was indispensable to the country’s cultural and economic life.

Music did not enact equality, but it helped Americans imagine and experience a less segregated society before that society had been fully realized.

The Uniting Practices of Cultural Diplomacy

The journey from Grever to Adams to Washington illustrates a principle repeated throughout popular music: culture advances through contribution, reinterpretation and exchange—not through the permanent protection of boundaries.

Cultural diplomacy can be most effective when it does not initially present itself as a political argument. Political debate asks people to defend their positions. A uniting cultural experience asks them to participate.

Music, art, literature, theatre, cinema and sport can create shared spaces before political agreement becomes possible. Their purpose is not to suppress injustice, erase legitimate differences or manufacture artificial harmony. It is to build relationships strong enough to prevent disagreement from becoming dehumanization.

Uniting practices may include intercultural orchestras and choirs, collaborative artistic projects, shared festivals, educational exchanges, sporting programmes and commemorations that acknowledge suffering without transforming historical memory into a weapon against people living today.

These practices do not require participants to abandon their identities or beliefs. They give them something meaningful to experience together.

Their effectiveness can be measured by whether they reach beyond an existing political camp, lower emotional hostility, create trust, expand coalitions and make dialogue socially possible. Their achievement is not the disappearance of disagreement, but the preservation of a human relationship through which disagreement can be addressed.

The Short-Term Efficiency of Division

This lesson has become increasingly urgent in contemporary democracies. Political movements on both the left and right now operate within an attention economy that often rewards alarm, humiliation and conflict.

The most divisive forces on each side can strengthen their counterparts. A provocation by one camp confirms the opposing camp’s darkest warnings. Retaliation then provides justification for further escalation. Each extreme becomes evidence for the other.

Divisive practices possess undeniable short-term efficiency. They attract attention, energize loyal supporters and simplify complicated questions. Anger travels rapidly, particularly through digital media. But attracting attention is not the same as achieving progress.

Division can mobilize an existing camp while making it more difficult to enlarge a community. It may win a news cycle, an election or an organizational advantage while weakening the society in which that victory must be exercised. Compromise becomes surrender, institutions become battlefields and political opponents become enemies.

The greatest gift the divisive left can give the divisive right and the divisive right can give the divisive left is confirmation of the claim that the other side is irredeemably hostile.

This does not mean that all political positions are equally justified or that all actors bear equal responsibility. The danger begins when any movement concludes that humiliation, fear and dehumanization are the most effective means of advancing its cause.

Cultural diplomacy must not demand silence in the face of injustice. But the method used to oppose injustice matters. Divisive methods often strengthen the very forces they seek to defeat.

The Greater Effectiveness of Unity

The difference between division and unity can be stated simply:

Divisive practices are efficient at mobilizing a camp; uniting practices are more effective at enlarging a community.

Uniting practices work more quietly, but their results can be more durable. They create curiosity where there was suspicion, familiarity where there was distance and affection where there was indifference. They allow people to reconsider their attitudes without first forcing them to admit defeat.

Shared joy therefore has social and political significance. People who listen, sing, laugh or celebrate together have not resolved every disagreement, but they have made it more difficult to regard one another as abstractions.

Black and white America did not move closer only by confronting what separated it. Americans also moved closer by discovering what they could love together.

That is the enduring meaning of “What a Difference a Day Makes.” A Mexican melody, American words and an African American voice reached Black and white listeners through beauty and joy. The participants did not need to share the same background or politics. For the duration of the song, they occupied the same emotional world.

A uniting song cannot enact legislation or repair an unjust institution. But it can change the human environment in which laws are debated, institutions are challenged and political decisions are made.

Cultural diplomacy begins with this modest but transformative insight: people do not always need to agree before they can come together. Sometimes, coming together is what makes greater agreement possible.

Division teaches people whom to fear. Cultural diplomacy helps them discover what they can love together and history suggests that shared love can travel farther than shared hatred.

What a difference a song makes. What a difference a uniting practice can make. And what a difference the wisdom to choose unity over division could still make in our world today.