In the late 1960s and early 1970s Reagle was a member of a psychedelic rock band Greylock Mansion. He played the organ and performed the lead vocals and was also the main songwriter for the group. The band released two singles in their active period but never got a deal for a full album. All of their old recordings were finally released in 2016 by an underground label Lysergic Sound Distributors. Unfortunately Merl Reagle died during the production of the album and never got to witness its release.