Click the flag twice (or until it doesn't play music when you click space) Click the play button to play (duh), and the next button to go to the next song (you have to wait a couple seconds).
You can't go bak to song 1 after you've reached song 17, you just have to click the flag again. There's a glitch at the beginning where it will sometimes play music when you click space (on the title screen) and I don't know how to fix it. Sorry! You also can't pause the music.
