 "Doctor Robert" was written by Lennon, although McCartney has since claimed co-authorship.A guitar-based rock song in the style of "And Your Bird Can Sing", its lyrics celebrate a New York physician known for dispensing amphetamine injections to his patients.On the recording, the hard-driving performance is interrupted by two bridge sections where, over harmonium and chiming guitar chords, the group vocals suggest a choir praising the doctor for his services.