Was listening to 'John Sinclair' today and it finally struck me where Lennon got the melody for this piece from. Can't believe I only noticed this now.
There is a passing similarity, I guess, but both songs are derived from 12-bar blues chord changes -- specifically a minor jazz-blues progression -- so that's likely the reason for the similarity. There are literally thousands of songs built of those basic songwriting blocks. It is possible that Lennon was unconsciously influenced by the Spider-Man theme song, of course, but given that both "John Sinclair" and the Spider-Man theme are blues derived songs, I think it's more likely to be a coincidence.
The '60s Batman theme tune is also 12-bar blues.
Last Edit: Dec 16, 2018 2:59:05 GMT -5 by Confessor