A. None of The Beatles could read or write music in the traditional way. George Martin and other pros would listen then transcribe their songs.
B. Till There Was You, written by Meredith Wilson for musical
The Music Man. Sung by Shirley Jones and Peggy Lee before Paul McCartney performed it with great skill and modulation. Ringo played the bongoes.
Wings biggest hit in the UK was this
Mull Of Kintyre
And is the best ever selling single there.