from wiki:
Stories of Phil Spector's gunplay mounted over the years, including his discharging a firearm while in the studio with John Lennon during the recording of his cover album Rock 'n' Roll, placing a loaded pistol at Leonard Cohen's head during the sessions for Death of a Ladies' Man, and forcing Dee Dee Ramone to play bass guitar to Spector's specifications at gunpoint.
http://en.wikipedia.org/wiki/Phil_Spector