Ellas McDaniel (born Ellas Otha Bates; December 30, 1928 – June 2, 2008), known as Bo Diddley, was an American singer, guitarist, songwriter and music producer who played a key role in the transition from the blues to rock and roll. He influenced many artists, including Buddy Holly, Elvis Presley, the Beatles, the Rolling Stones, the Animals, George Thorogood, and the Clash.
His use of African rhythms and a signature beat, a simple five-accent hambone rhythm, is a cornerstone of hip hop, rock, and pop music. In recognition of his achievements, he was inducted into the Rock and Roll Hall of Fame in 1987, the Blues Hall of Fame in 2003, and the Rhythm and Blues Music Hall of Fame in 2017. He received a Lifetime Achievement Award from the Rhythm and Blues Foundation and the Grammy Lifetime Achievement Award. Diddley is also recognized for his technical innovations, including his distinctive rectangular guitar, with its unique booming, resonant, shimmering tones.

Born in McComb, Mississippi, as Ellas Otha Bates, he was adopted and raised by his mother's cousin, Gussie McDaniel, whose surname he assumed. In 1934, the McDaniel family moved to the South Side of Chicago, where he dropped Otha from his name and became Ellas McDaniel. He was an active member of Chicago's Ebenezer Baptist Church, where he studied the trombone and the violin, becoming so proficient on the violin that the musical director invited him to join the orchestra. He performed until he was 18. However, he was more interested in the pulsating, rhythmic music he heard at a local Pentecostal Church and took up the guitar.
Inspired by a John Lee Hooker performance, he supplemented his income as a carpenter and mechanic by playing on street corners with friends, including Jerome Green (c. 1934–1973), in the Hipsters band, later renamed the Langley Avenue Jive Cats. Green became a near-constant member of McDaniel's backing band, the two often trading joking insults with each other during live shows. During the summers of 1943 and 1944, he played at the Maxwell Street market in a band with Earl Hooker. By 1951 he was playing on the street with backing from Roosevelt Jackson on washtub bass and Jody Williams, whom he had taught to play the guitar. Williams later played lead guitar on "Who Do You Love?" (1956).