- Mar 2 Robert Wilfred Levick Simpson, composer
- Mar 4 Halim El-Dabh, Egyptian-American composer (Martha Graham Ballets), born in Cairo, Egypt (d. 2017)
- Mar 6 Julius Rudel, conductor (NYC Opera 1957), born in Vienna, Austria
- Mar 8 Egbert George "Pete" Pitterson, trumpeter
- Mar 11 Astor Piazzolla, Argentinian banodeonist & composer (Tango Nuevo), born in Mar del Plata, Argentina (d. 1992)
- Mar 12 Gordon MacRae, American singer and actor (Oklahoma!, Carousel), born in East Orange, New Jersey (d. 1986)
- Mar 12 Ralph Shapey, American composer (Fantasy, Rituals), born in Philadelphia, Pennsylvania (d. 2002)
- Mar 13 Carlo Prosperi, Italian composer, born in Florence, Italy (d. 1990)
- Mar 20 Primoz Ramovs, composer
- Mar 21 Antony Hopkins, composer
- Mar 21 Arthur Grumiaux, Belgian violinist
- Mar 26 Joe Loco [Jose Esteves, Jr], musician
- Mar 27 Harold Nicholas, American dancer known as one of the world's greatest dancers (Nicholas Brothers), born in Winston-Salem, North Carolina (d. 2000)
- Mar 30 Kan Ishii, Japanese composer, born in Tokyo (d. 2009)
- Mar 30 Oto Ferenczy, composer
About March 1921
How Old? 99 years old
Generation: Greatest Generation
Leap Year: No