 Although " T Rex devotees " , in the words of Starr biographer Alan <unk> , claimed that <unk> had ghost @-@ written " Back Off <unk> " , Starr later acknowledged that Harrison co @-@ wrote the song by adding some chords and finishing the melody . As on Starr 's 1971 hit single " It Don 't Come Easy " , Harrison was not credited for his songwriting contribution . Starr originally offered " Back Off <unk> " to fellow <unk> <unk> Black to record , but she declined , hoping instead to record another new Starr – Harrison composition , " <unk> " . 
