Blues rock

From 1964 to 1970, it is heard on fifteen recordings. 'You Can't Do That' is the earliest, from 1964, and 'I've Got a Feeling' the last, from 1970. It goes quiet after 1965 and comes back in 1968 for 'Revolution 1'. John sings lead on nine of the fifteen, two for Paul, and the two of them together on three, with George on one. Lennon wrote twelve of the fifteen, including 'Come Together' and 'Day Tripper', 12% of his songs against 4% of Harrison's. On 'Helter Skelter': pentatonic/blues-derived material. On 'Revolution' it is 12-bar verse structure. Of those, 'Revolution 1' has unique pre-chorus section, and only two other recordings do.