DropTunes is sort of a combination of those two applications. DropTunes allows the user a player for their Dropbox-synced tunes offering Flash or HTML5 with streaming and continual playback. All you need to do is log onto DropBox through DropTunes, and pick out the proper folder with the music stash. There is also syncing the iTunes library with Dropbox for sharing tunes with fellow Dropbox users.
DropTunes it supports Flash-free and HTML5 playback, but it doesn’t seem to support iOS or Android, however, you might be able to go through the browsers on Apple or Android devices. DropTunes is currently a Free service that can be acquired here.