If you were unaware, and this is the first Scratch project you've seen, ever, then here's how all music button projects work. The word on the button means that it is the song. Occasionally I will add in some more themes so that you don't have to keep requesting new ones. Press the Green Flag to reset.
Credit to Re-Logic for Grass & Guide. Audio by Scott Lloyd Shelly. What themes should I add? Leave your answers in the comments. They have to be Terraria themes though, for specific and obvious reasons. --UPDATES-- 14/01 - Added Corruption, Jungle and Boss 1 themes 11/03 - Added Lunar Boss and Pumpkin Moon themes 23/04 - Added Ice / Tundra theme (requested by @robdummy) 24/04 - Added Pirate Invasion theme