July 1974: George McCrae's "Rock Your Baby" was all over the radio and discoteques

Disco music was known as dancing music.   It became disco later in 1978 with "Saturday Night Fever".    

George McCrae may not have invented disco but he had millions dancing from coast to coast:  "Rock your baby":

P.S.  You can listen to my show.  If you like our posts, please look for ”Donate” on the right column of the blog page.