The #1 song on April 21, 1975

(Hey Won't You Play) Another Somebody Done Somebody Wrong Song By B. J. Thomas

Other #1 songs on April 21, 1975

UK #1 Song

Bye Bye Baby
Bay City Rollers

#1 R&B Song

Shakey Ground
The Temptations

#1 Country Song

Blanket on the Ground
Billie Jo Spears

#1 Dance Track

Bad Luck
Harold Melvin & the Blue Notes

Notable April 21 birthdays in the 1970s

Michael Turner

Born April 21, 1971
Rob Riggle

Born April 21, 1970