They have tracks in common. The soundtracks can be downloaded on Jake Kaufman's bandcamp pages:
To add to what Pierre said, I've noticed a lot of songs from the original have been remixed in Pirate's Curse.
Just in case: contrary to the indications of Sky and Mimic, you can't access Mount Pointy by going east of Water Town, you have to climb it by going west of Oasis Town. It's a relatively famous oversight from the game's programmers.
hm ok..
also mount pointy #1 best name for a mountain lel
1. Yeah, typical humour from the Shantae series.
2. Yeah, that's called artifical prolongement of a game duration through backtracking, a practice usually not well perceived nowadays. Once acquired, the Warp Dances do cut this down a bit, though.
Possibly, I guess it's an explanation.