Chart Music's Hidden Power: Unlock It Now!

I made a list of all the hidden charts i could find in muse dash. If one says specific after it then look at the bottom to see how to get the hidden chart! To get most of them, just keep on. Some songs require spamming the button, some need other methods. When spamming the button is the method, a little note pops up and the difficulty increases.

(after unlocking balcony) talk to wendell to receive riddle#1, then interact with the third pillar counting from top on the left side of north bridge to unlock a chart.