Fieger died at his a home in Woodland Hills near Los Angeles after a six-year battle with cancer, according to The Knack's manager, Jake Hooker.
He formed The Knack in 1978 and the group quickly became popular in LA rock clubs.
It was when Fieger co-wrote and sang lead vocals on My Sharona that the band started to become known beyond the Sunset Strip.
Fieger said the song was inspired by a girlfriend of four years.
"I had never met a girl like her, ever," he said in a 1994 interview.
"She induced madness. She was a very powerful presence.
"She had an insouciance that wouldn't quit. She was very self-assured.
"She also had an overpowering scent, and it drove me crazy."
My Sharona held the number one spot on the Billboard pop chart for six weeks.
It was credited for ending the reign of the '70s disco queens, as it was the first rock song to bump a disco track from number one in several years.
https://youtube.com/watch?v=kVdnqEyToqg