Glen Campbell isn't just a country/pop star from the 60s and 70s- he was one of the most accomplished and in-demand studio musicians of the era. Campbell's work can be heard on hit recordings by Bobby Darin, Ricky Nelson, The Kingston Trio, Merle Haggard, The Monkees, Elvis Presley, Frank Sinatra, Dean Martin, The Troggs, Frankie Laine, The Association, Jan & Dean, and The Mamas & the Papas.
Campbell was a touring member of The Beach Boys, filling in for Brian Wilson in 1964 and 1965 playing bass guitar and singing falsetto harmonies. He played guitar on the group's Pet Sounds album, among other recordings. Other classics featuring his guitar playing include "Strangers in the Night" by Frank Sinatra, "You've Lost That Lovin' Feelin" by The Righteous Brothers, and "I'm a Believer" by The Monkees. (via Wikipedia)
I remember watching his variety show in the 70s. As the clip above shows, he's still rolling along.