John Fogerty was working at a gas station in high school when the Beatles hit big with Please Please Me in Feb 1963, and it motivated him to work harder on music

 https://podcasts.apple.com/us/podcast/john-fogerty-the-suitcase-behind-the-microphone/id1510058141?i=1000528191939

Fogerty got the inspiration for the song Working Man from the jobs the band members had before turning professionals. They worked in a gas station, and as truck drivers and janitors

https://sites.google.com/site/theelectricbayou/songs/the-working-man

CCR was the only American band that beat the Beatles head-to-head in record sales

John Fogerty gets his first guitar when he is 12 years old. Due to the family’s tight financial circumstances, he and elder brother Tom club together to rent this guitar for five dollars per month. John takes guitar lessons from Barry Olivier, the creator/producer of the Berkeley Folk Festival.

https://rockportraits.wordpress.com/2014/09/28/creedence-clearwater-revival/

He wrote the Proud Mary line about "Left a good job in the city, working for the man every night and day" to celebrate his honorable discharge from the Army Reserves