- Apr 1 Douglas Allenbrook, American pianist, harpsichord player, and composer, born in Alton, Massachusetts (d. 2003)
- Apr 1 Steve Race, British composer, jazz pianist and radio and television presenter (BBC's "My Music", 1967-94), born in Lincoln, England (d. 2009)
- Apr 1 William Bergsma, American composer (The Fortunate Islands; The Murder of Comrade Sharik), and educator (Juilliard, 1946-63; University of Washington, 1963-86), born in Oakland, California (d. 1994)
- Apr 6 "Big" Walter [Horton], American blues harmonica player (Everybody's Fishin'), born in Horn Lake, Mississippi (d. 1981) [some sources cite year as far back as 1917]
- Apr 6 Andrew Imbrie, American contemporary classical composer, and pianist, born in New York City (d. 2007)
- Apr 8 Jan Novák, Czech classical composer and contemporary Latin poet, born in Nová Říše, Moravia, First Czechoslovak Republic (d. 1984)
- Apr 10 Sheb Wooley, American vocalist ("The Purple People Eater"), born in Erick, Oklahoma (d. 2003)
- Apr 19 Will Ogdon, American composer, born in Redlands, California (d. 2013)
- Apr 22 Cándido Camero, Cuban American percussionist (congo drum) and bandleader, born in Havana, Cuba (d. 2020) [1]
- Apr 22 Philip "Gabby" Pahinui, Hawaiian slack-key guitarist and singer, born in Honolulu, Territory of Hawaii (d. 1980)
- Apr 23 Janet Blair [Martha Janet Lafferty], American singer and actress (Leave it to the Girls, Smith Family), born in Altoona, Pennsylvania (d. 2007)
- Apr 24 Laci Boldemann, Swedish composer, born in Helsinki, Finland (d. 1969)
- Apr 26 Jimmy Giuffre, American jazz clarinetist, composer, arranger, and proponent of "free improv" jazz, born in Dallas, Texas (d. 2008)
About April 1921
How Old? 103 years old
Generation: Greatest Generation
Leap Year: No
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