Bside's thread made me think we also need a musicals thread! What are some of your favorite musicals, and what songs do you love most from them?
Here are a few of mine:
The Sound of Music - "Edelweiss," "Do, Re, Mi," "Sixteen Going on Seventeen"
Mary Poppins - "Spoonful of Sugar," "Supercalifragilisticexpialidocious"
OKLAHOMA! - "People Will Say We're In Love" duet, "Out of My Dreams," "Lonely Room"
My Fair Lady - "I'm Getting Married in the Morning," "I Could Have Danced All Night," "Without You"
Lady in the Dark - "My Ship" and "the Saga of Jenny" (Okay, I've never seen this show, but those songs rule)
Brigadoon - "Almost Like Being in Love"
Silk Stockings - all of them, can't pick one

If you haven't seen this, rent it! Cyd Charisse + Fred Astaire + fantastic score, dancing, and costumes = SWOON.
Victor/Victoria - "Le Jazz Hot," "Crazy World." I like the movie better than the show. Rent this, too!
I'll stop there for now. Now you guys go!
Edited: to make the list easier to read.