He encontrado este link en otro foro y me ha parecido interesante. Acabo de empezar a leerlo, pero ya las primeras secciones son interesantes. P.ejem, estructura típica de sus canciones:
The music of the Beatles uses the form parts common to popular music:
intro -- an introduction to the song;
verse -- a form part that is repeated several times, with the same harmony and melody, but with different lyrics each time;
chorus -- a form part that is repeated several times, with the same harmony, melody and lyrics each time; different from the verse at least as to lyrics, but almost always also as to harmony and melody, too;
bridge -- a contrast to verse and chorus, containing new harmonic, melodic and lyrical material, in Beatles songs most often played twice;
solo or instrumental interlude -- like the bridge, a contrast to other form parts, in Beatles music most often played on guitar. The solo mostly is played over another form part (e.g., "solo over the verse"), but sometimes uses new harmonic material;
pre-chorus -- a form part after the verse, building up to the chorus, seldom used by the Beatles and their contemporaries but very common in rock music of the 1980s and 1990s;
coda -- an ending to the song.
https://2akordi.net/znanje/teorija/beatles.html
Complemento con este otro link, también sacado de aquel foro, sobre cada clave musical y las emociones asociadas a ellas:
http://biteyourownelbow.com/keychar.htm