Because John Lennon’s re-used the “Here come old flat-top” line of lyrics in “Come together” from Chuck Berry’s “You can’t catch me”, which Morris Levy was the publisher of, Lennon was threatened by a law suit for copyright infringement unless he recorded at least three Levy-published songs to the album after “Mind Games”. When Lennon did not (cf. “Walls and Bridges” – in fact recorded after “Rock’n’Roll” produced by Snail Spector), Morris Levy sold these under the name “Roots” by mail order after Lennon thoughtlessly handed over the rough mixes of “Rock’n’Roll” to him. “Roots” was promptly deleted once legal action was taken against it. The legitimate album was rush-released shortly thereafter.