His name was Mike Pinder and he was one of the founding members of the group that had hits with "Go Now" and "Nights In White Satin." Pinder became a master of the Mellotron, and introduced John Lennon to the instrument, leading it to appear on Strawberry Fields Forever.

It was Pinder's voice you hear narrating the poem at the end of the Moody's classic nine-minute long "Satin." 

He was 82.

Mike Pinder, the Moody Blues Keyboardist and Founding Member, Dead at 82