Written by Buddy Holly, Jerry Allison, and Norman Petty
"Peggy Sue" was originally called "Cindy Lou", and was named for Buddy Holly's niece, the daughter of his sister Pat Holley Kaiter. The title was later changed to "Peggy Sue" in reference to Crickets drummer Jerry Allison's girlfriend (and future wife), Peggy Sue Gerron, with whom he had recently had a temporary breakup.
The song went to #3 on the Billboard Hot 100 in 1957.
Courtesy of wikipedia
Buddy Holly September 7, 1936 – February 3, 1959