Nary a one. Cowboys, hoodlums and monsters should NOT be singing to one another. It's just not natural.
The Wizard of Oz.
I know every song.
Hmm I would say Grease.
Rocky Horror Picture Show.
I know it sounds cheesy but....HSM! I love other musicals such as Rocky Horror Picture Show and Grease, but I don't know...something about those movies just grab me!