What was the producer of "All Shook Up" commonly referred to as?
All Shook Up (Cheap Trick album):  As such, this was the first album since their debut to be produced by someone other than Tom Werman. George Martin:  He was referred to as the "Fifth Beatle", including by Paul McCartney, in reference to his extensive involvement on each of the Beatles' original albums.
"Fifth Beatle"