Ok this is totally cool. Club Penguin has the sheet music to the April Fools day theme song. You can print it here. I think I'm going to pick up that guitar that's in my closet, or the keyboard and play it.
Anyway... Happy77 talked to the Music Artist and interviewed. Here is what they said:
Q: We checked out the sheet music - Where can penguins find that song in Club Penguin?
A: You can hear it on the homepage when you click the Tour Guide and start the movie.
Q: The team is doing some work at the Lighthouse stage so that (just like during the Music Jam) we'll be able to hear certain instruments when we play there. What do you think?
A: I'm glad. However, I personally like seeing the songs that penguins play and sing all over Club Penguin even more.
Q: Do you play any instruments? Got any quick tips to share with other musically inclined penguins?
A: Yep, I can play a few - the alto saxophone, a few percussion instruments, but my all-time favorite is the piano. To any of you who play real instruments, keep it up! Find a song and see if you can learn how to play it, or even try and compose your own music. All of Club Penguin's music is made by someone, and maybe someday that someone could be you!
In other news: get ready for some new music in your igloo, because there is some from the Music Jam!
There are three new catalogs! Check out the cheats for each of them: 
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