A large number of Beatles studio outtakes are available on bootlegs, ranging from complete session tapes—for example, the morning sessions for the "Please Please Me" album—to more fragmentary samplings, or alternate mixes and performances derived from acetates. The first studio outtake to appear on bootleg was the White Album outtake "What's The New Mary Jane" in 1972, which fell into the hands of bootleggers via an acetate that Lennon had traded to a friend. In 1977, rough mixes from acetates of "I Am the Walrus" and "The Fool on the Hill" appeared on bootlegs after being played on a Radio Luxembourg broadcast.