A keyboard player for the 1960s psychedelic rock group Strawberry Alarm Clock, Weitz was the principal composing member of the band.
Weitz was an able composer, and for the group's 1967 single on the all American label he submitted three songs: "The Birdman of Alkatrash", "Heart full of Rain", and "Incense and Peppermints".
The latter, turned over to another composer by the record's producer to write the lyrics, became a #1 national hit for the group, newly christened Strawberry Alarm Clock.
Weitz played keyboards for Smashing Pumpkins frontman Billy Corgan's side project Spirits in the Sky,[1] which toured for several weeks in 2009.
[2] Mark Weitz and Ed King wrote the melody for Incense and Peppermints, with John Carter composing the Lyrics.