Probably the best DropBox app, needs work – BoxyTunes - audio, music, and podcast player for Dropbox Review

Easy to set it up. Easy to pick sings one at a time from a single album to download to your device and play. Understands the metadata from mp3's. No navigation by album or artist. No streaming. Not good enough. Better than the other options though.
Review by Fanfoot. on BoxyTunes - audio, music, and podcast player for Dropbox.