In the 1960s and 1970s, bootleggers provided quite a few collections of Beatles outtakes. One of them was Dr. Robert, which was recorded in 1966 and 1967 and focuses on outtakes of songs that, for the most part, ended up on such albums as Revolver and Magical Mystery Tour. The sound quality is excellent, and in most cases, the outtakes are only slightly inferior to the master versions. Though not for the casual listener, collectors and hardcore Beatles fans will be fascinated by alternate gems that range from "Penny Lane" and "I'm Only Sleeping" to "Doctor Robert" and "Blue Jay Way." Most of the songs are very psychedelic -- the Beatles were taking a lot of chances in 1966 and 1967, and their ambitious, risk-taking spirit shines through on this bootleg.