George McCrae - Rock Your Baby (1974)

Soul and disco classic. George McCrae was about to return to college, when Richard Finch and Harry Wayne Casey of KC and the Sunshine Band invited him to sing the lyrics for a song that they had recorded for the band, but could not reach the high notes that were required for the song. In fact the original intention was that Gwen, his wife, should record it, but she was late for the session and George recorded alone. It suited his high-pitched voice to the extent that the song 'Rock Your Baby', became one of the first hits of the disco era in 1974, selling an estimated eleven million copies worldwide, topping the charts in the U.S., UK, and over 80 other countries.