Alan W. Pollack's "Notes on..." series
Alan W. Pollack’s exhaustive analysis of the music of The Beatles. He wrote these over the course of 11 years, starting in 1989, in weekly posts to the rec.music.beatles usenet group. For example, in his ‘Notes on “Hey Jude”’, he says “The bridge features a Bach-like walking bassline which, by the way, is a key source of the perceived contrast between the bridge section and its surrounding verses; the bassline of the verse, after all, simply follows the roots of the chord changes.” Fascinating and edifying. Bonus.