Ode to the musical finale!
Not only are they an appropriate and satisfying ending to the story, but they also amp up the emotional impact of what could have been a less-than-fantasmic denouement. Here are some of my favorites:
Dirty Dancing ~ Time of My Life
Sister Act 2 ~ Joyful Joyful
Grease ~ The One That I Want/We Go Together
Shrek ~ I'm a Believer
Annie ~ I Don't Need Anything But You
Mary Poppins ~ Let's Go Fly a Kite
Footloose ~ Footloose
Not a complete list, but I could seriously sit here and do this all day. I'd love to see what some of your favorites are. Please share!