No matter what you feel about the show, The Partridge Family, you gotta love the theme song. Come On, Get Happy - written by who, exactly? Played by whom, exactly? We all know David Cassidy performed the vocals, but that's about all I can figure.

We also know that Shirley Partridge wasn't playing the keyboards to this, or any, song.

Who was the great keyboardist to this theme song?

I have a feeling it was some unknown studio musician.