I'm glad you enjoyed it! Thank you so much for playing!! :)
You can't see all the music in the music room unless you play through again and unlock everything. However, there is a playlist that was made online of most of the music in the game! (The only song missing is "Confessions".)
https://www.youtube.com/playlist?list=PLL-GdLU7W1JybqsjlQWCq_0TAVcLV_CJ9