I'm only basing this on the movies since i haven't had the chance to see many live (i have seen 3 on Broadway [Beauty and the Beast, Cats, Phantom of the Opera], and 2 of school performances [The Sound of Music, My Fair Lady, and some of 42nd street -since i was in it ^^])
Sweeney Todd: The Demon Barber of Fleet Street: LOVE that movie! (one of my favorites ^_^) I know none of the actors in are professional singers, but the movie and the songs just came out beautiful (now i need to see the recording of the performance with the original cast from the 80's)
Nightmare Before Christmas: although it's not based on any musical, i love this movie. The songs are just wonderful, and heartwarming. <3
other ones i just love:
Little Shop of Horrors
Across the Universe
Some that i really want to see are Les Miserables (though i'm going to see my school's performance of it this year), Avenue Q, Wicked, and The Producers (i know i forgot some >.>)
Sweeney Todd kicked ass it was awesome , when i saw it with my dad he liked it, but thought the movie didn't need the blood, but i disagree with him, its one of my favorite tim burton movies too.
THE GREATEST THING ABOUT BALLS, IS THAT STATEMENT IN AND OF ITSELF!
My favourite would have to be CATS. My favourite characters in this musical are Mungojerrie, Rumpleteazer and the Magical MisterMistofeeles!
Some other ones include:
-The Phantom of the Opera
-My Fair Lady
-The Sound of Music
-Nightmare Before Christmas
-Crazy for you (my school did a production of this )