[robert casey]

Maybe the most musically literate people don't find it vapid. For
instance, you mentioned "Good Day Sunshine," which has unbalancing
metrical tricks in the chorus. In context, it follows "She Said, She
Said" which also has non-standard meter but in a contrasted style. No
amount of analysis will make you like the song if you don't, but there's
plenty of musical interest there.

Stephen

Besides, their music had a good beat.... :-)