If I exclude all of "Rubber Soul" (their finest album and just about the best pop album ever made), I like "The Night Before" from "Help!" The quintessential Beatles pop tune--Paul at his bounciest. Lots of others rocked more, or were more intellectually satisfying, but "Night Before" is the near-ideal.
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.