Biographer Anthony Reynolds writes in the 2010 book "Leonard Cohen: A Remarkable Life" that friend and fellow Canadian songwriter Joni Mitchell tried to warn Cohen about working with Spector, Mitchell having witnessed some of the insanity between Spector and Lennon in Los Angeles, but initially - at least at the songwriting stage - the pair worked well together. Songwriter John Prine, who had also witnessed the producer's bizarre antics when he had been invited to his house to compose a song together, later marveled to Paul Zollo of "BluebirdRailroad" magazine that as soon as Spector "sat down with an instrument, he was normal." Things would change once Cohen and Spector entered a studio, with the producer's paranoia taking over and Cohen becoming increasingly disengaged from the project.