Song Help - The various classical songs in the movie

I'm trying to complete my compiled soundtrack for the film and noticed quite a few classical songs scattered about the movie. Other than "Enrico Caruso - Vesti La Giubba" (which I have), "Gerardo Hernán Mattos Rodríguez - La Cumparsita" (which I also have, but the film version was obviously made for it, since the original is slower in pace), "Edward Elgar - Pomp and Circumstance March No. 1" (Graduation music) and "Johann Sebastian Bach - Toccata and Fugue In D Minor" (Phantom of the Opera organ music during the wedding), can anyone tell me the composer and name of the other tunes heard? Thanks for the help.

"Wherever You Go, There You Are." - Buckaroo Banzai