The Be Sharps are based heavily on The Beatles. Here are some references you may have spotted:
The Beatles played their first gigs at The Cavern Club; The Be Sharps played at Moe's Cavern.
A member is replaced.
The album ''Meet the Be Sharps'' and its cover.
Nigel's line, ''You've just recorded your first number one.''
Apu changing his surname from "Nahasapeemapetilon" to "de Beaumarchais" is a reference to Ringo Starr having changed his name from Richard Starkey. Barney's girlfriend looks like Yoko Ono, John Lennon's girlfriend and the track ''Number Eight'' is a reference to Beatles' track, ''Revolution No. 9.''
The ''Bigger Than Jesus'' joke.
The ''Coop coop a-doop'' line from one of the songs is similar to the ''Goo-goo-a-joob'' line from ''I Am The Walrus.''
The final rooftop performance is something The Beatles did; in fact, George Harrison passes by in this scene and says: ''It's been done'', referring to himself.
The fans shouting "Wiggum forever, Barney never!" then "Barney forever, Wiggum never!" is similar to when Ringo Starr replaced Pete Best as drummer. Fans of Best would fight at the Cavern Club, shouting "Pete forever, Ringo never!" Other fans shouted the contrary, "Ringo forever, Pete never!"