Who taught the oboe in the " small , rather stuffy music room " in the basement where Lennon and McCartney sat at the piano and composed ' I Want to Hold Your Hand ' ?
Lennon also played keyboards besides piano ( electric piano , Hammond organ , harmonium , Mellotron , harpsichord , clavioline ) , harmonica , six - string bass guitar ( either he or George Harrison , when McCartney was playing piano or guitar ) , and some percussion ( in the studio ) .