@Wonder
Those are character titles, not songs. You know, like
'The Unmoving Great Library' for Patchouli,
'Shrine Maiden of Paradise' for Reimu, or *giggle*
'Chinese Girl' for Meiling. That last title always gets me. Why 'Chinese Girl' out of all possible titles? Why, Zun, why?
The music is unlisted but I do have ideas for what they would be. For music, I would come to two thought processes. One; what songs in my immediate collection could fit in? Two; if I composed my own music, what names would they have?
For an example, here's a piece that could fit in for Trista's Stage Theme or Kris' Theme:
https://www.youtube.com/watch?v=gR4iFDXmpAwThe chimes in the background can suggest an icy or spatial feel to one's surroundings. Like one is in a frozen wonderland or on the moon. While the energy and speed of the actual music could be used for either a stage or a boss.