Nice job on Donkey Kong and Peach (Noticed in the very first party game art works, with Mario (wearing a wing cap) holding hands with his friends, Yoshi, Peach, DK, Luigi and Wario.)
Sleeping Beauty Waltz existed long before Disney's Sleeping Beauty came out, and I highly doubt they own the rights to the song. I'm also pretty sure the game developers wouldn't use a song illegally.
Mario:luigi Luigi:yeah mario? Mario:look at this remember our dad die because he kill him Luigi:yeah im still mad for that Mario:don't worry luigi follow me Luigi:ok Donkey kong: hey luigi Luigi:come with me Donkey kong:ok Mario:come peach Peach:mario? Mario:theres no time to explain lets go Luigi:donkey kong how about i give you all my bananas for peach Donkey kong:sure Luigi:oh yeah can't wait to tell mario about this Donkey kong:tell him about what Luigi:nothing now go eat the bananas (donkey kong shrugged and ate) Mario :luigi good job bro Luigi:no problem Peach:thanks mario luigi Mario Luigi:your welcome