I have been using REVERBNATION for a few years now and I truly believe it is one of the best (free) promotional package available for independent musicians.
Amongst the many tools the platform offers, they have recently added the possibility to create (in just over 5 minutes) an Android app featuring your music, photos, videos and anything else you feel is important for fans to grab what your band is about.
So, without further ado here is the brand new BARON ZERO android app as a free download.