Am I a man or a muppet? from "The Muppets"
What a brilliant song. Not just perfect for the movie, perfect for all ages of audience, perfect to sing along to and perfectly funny, it is even motivational.
Jason Segel and Peter Linz sing about their movie character personalities and the song is excellently tied into the movie with reflections and guest appearances.
The song gets additional bonus points because it was written by the NZ legend, Brett McKenzie.
Read the wiki page here: https://en.wikipedia.org/wiki/Man_or_Muppet
Watch it here: 
89k likes, no dislikes. I can't do it justice with a blog post.