Collect Shiny Trinkets to unlock more songs in the Jukebox.

ecroF evitisoP: Collect twenty trinkets.
Pipe Dream: Collect twenty trinkets.
Popular Potpourri: Collect eighteen trinkets.
Positive Force: Collect eight trinkets.
Potential For Anything: Collect twelve trinkets.
Predestined Fate: Collect sixteen trinkets.
Presenting VVVVVV: Collect ten trinkets.
Pressure Cooker: Collect fourteen trinkets.
Pushing Onwards: Collect five trinkets.