Creed Bratton

This 1969 performance by pop group The Grass Roots of their single 'Bella Linda' - a re-write of an Italian pop song - features an opening shot of group member Creed Bratton. He was with The Grass Roots from 1967 to 1969, but it didn't end amicably:

Creed Bratton became frustrated by [record company] Dunhill's refusal to allow the band to write its own songs and play the instruments on its records (although the members did play alone at concerts). After a disastrous appearance at the Fillmore West in April 1969, a "slightly inebriated" Bratton was asked to leave the band.

Bratton later achieved fame playing a character also called Creed Bratton on the US version of The Office. There's a nice interview covering his career and his new album on Popdose.