I'm EXTREMELY glad the Pokemon Mystery Dungeon series has made its was onto this site! There are plenty of simply great tunes to be picked up from these games such as: the memorable Tiny Woods where the first dungeon of the first adventure starts in "Blue/Red Rescue Team", Amp Plains or Concealed Ruins from "Explorer's of Sky", or the orchestrated final battle against the Bittercold in "Gates to Infinity". Personally, I would take a listen to the peaceful, heroic, and saddening ending tunes to each game - specifically Farewell in "Blue/Red Rescue Team", "Wrapped in Light" (and the few that follow) in "Gates to Infinity", and especially Don't Ever Forget in "Explorer's of Sky". But definitely check out the variety of tunes used in each dungeon; each tune has its own unique, short, melodies that might catch your attention.