Play the Muslim call to prayer for a room full of blues fans, then play a Mississippi work song recorded in the 1940s, and watch what happens to their faces.

That is the demonstration the historian Sylviane Diouf has been running for the better part of thirty years. She pairs a recording of the adhan with “Levee Camp Holler,” a work song the folklorist Alan Lomax preserved on tape, as reported by The Conversation. Diouf has argued the two blur into each other under close listening, sharing elongated syllables, a wavering pitch and the same ornamental phrasing. The Smithsonian’s National Museum of Asian Art makes the same case about the field holler in general, tracing its florid melodic lines and notes outside the Western scale to the same tradition of Qur’anic recitation.

No footnote works that fast.

The numbers are slipperier than the sound

Counting how many enslaved Africans arrived in the Americas as Muslims is far harder than hearing the resemblance. Estimates run from roughly 4 per cent to 20 per cent of the 12.5 million people shipped across the Atlantic, a spread New Lines Magazine has described as the honest state of play. Diouf puts her own figure at close to a million, as she has written for the Organization of American Historians. The historian Michael Gomez has refused to put a number on it at all. In a 1994 paper for the Journal of Southern History, he committed only to thousands, possibly tens of thousands, according to an H-Net summary of the paper. The rest of his case, built up across his wider body of research on Islam in the Americas, rests on smaller and harder evidence, per JSTOR Daily: Muslim names surfacing again and again in runaway advertisements in South Carolina, Georgia and Louisiana, often in rice country, where planters deliberately sought captives from regions where the crop was already known.

A minority, then, and possibly a tiny one. Whether a small group can leave an enormous stylistic fingerprint is a separate question,.

The man who wrote on the walls of his cell

Omar Ibn Said was about 37, and twenty-five years into his studies, when an army swept through his part of Futa Toro in what is now Senegal, killed a great many people, and sold him into slavery. He landed in Charleston in 1807, escaped a cruel owner, and was jailed in Fayetteville, North Carolina, where he spent sixteen days covering the walls in Arabic script nobody around him could read.

He was taken into the household of the state governor’s brother and stayed there until his death in 1863, in his nineties. In 1831 he wrote a fifteen-page account of his life in Arabic, opening it with a chapter of the Qur’an. It is the only known surviving autobiography written in Arabic by an enslaved person in the United States, and it now sits in the Omar Ibn Said Collection at the Library of Congress, digitised alongside 41 related documents.

One literate man in a jail cell is not a musical tradition. He is proof that it had carriers, that they were educated, and that some of them held on.

What the ethnomusicologist actually claimed

The sharpest technical case belongs to Gerhard Kubik, an Austrian ethnomusicologist who spent forty years on the question and published Africa and the Blues with the University Press of Mississippi in 1999.

Kubik proposed that rural Deep South blues merged two distinct song traditions from the west central Sudanic belt. One he labelled Arabic-Islamic: declamatory, heavily melismatic, sung over a droning reference tone with a stringed instrument, of the kind found among the Hausa. The other was far older, a pentatonic savanna style tied to work rhythms, which he traced to millet-farming cultures thousands of years old. Melisma, in plain terms, is stretching one syllable across many notes, the move that turns a single “oh” into a small journey. Kubik argued the Islamic layer sat over the ancient pentatonic one, and that Delta blues carries an unusually heavy dose of it because captives from Mali, Niger and Mauritania brought it with them.

He was blunt about the limits. In an interview with Afropop Worldwide, Kubik pointed out that the recorded blues sample runs only from the 1920s to the 1940s, while West African savanna field recordings barely begin before the 1950s. Everything in between is inference resting on the assumption that these vocal habits resist change. He also suspected the transmission ran through a handful of families who kept one way of singing alive, making the blues a case of a minority style winning out.

The word the scholar refuses to use

“We are not roots to anyone,” Kubik told Afropop Worldwide. He loathes the word entirely, calling it too vague for historical work and accusing it of quietly casting one continent as raw material to be processed somewhere else. Slogans of the Mali-to-Mississippi variety, he added, are useless to anyone actually trying to establish which tradition, whose, and in which decade.

That makes the marketing history awkward. When Martin Scorsese travelled up the Niger for Feel Like Going Home, the 2003 documentary in which Corey Harris played alongside Ali Farka Touré, the premise was that Malian music was the ancestral source. Kubik’s reading of Touré, made in the same interview, is less romantic. Touré liked John Lee Hooker records, absorbed some of that, was told by European admirers he sounded like the blues, and by the end of his life had tired of being cast as somebody else’s origin story.

The honest version is thinner than the legend and stranger than the debunking. Some small number of people carried a way of using the voice over an ocean, under conditions designed to strip it from them, and it survived long enough to turn up in a Robert Johnson recording. Nobody in Mississippi was calling anyone to prayer. Something in how they sang had simply refused to die, and it ended up in the bloodstream of a music the world would later buy as the sound of America.