Press the space bar, and then press either 0 or 1. If you want to stop the song, then click the stop button, but you'll have to press the space bar again to choose a song.
Suggest in the comments for more songs since I only have 2 right now. Thanks to yasiicow and _Chat_Noir for the music. I wanted to throw this project out so you guys out there can kick back and relax. It would be better if you close your eyes.