Declined by The Beach Boys, Brian tossed it to an L.A. session player to thank him for a huge favor: How Glen Campbell found "Guess I'm Dumb" in 1964 + 2 covers, all spanning 4 decades!
Glen, originally from Arkansas, moved from Albuquerque to L.A. in 1960, where things began happening….fast. In early 1961, he got a job writing songs and recording demos at American Music Publishing,…