Dabump App
Dabump is a free collaborative social spports app that offers “quick, simple, and highly collaborative” music-making. Like other music compilation apps, Trackd leans on the idea of a global social network of creators that are easily accessible. You can easily chat in the app, ping someone for a guitar idea, and have it back in no time and all on your phone.
https://play.google.com/store/apps/details?id=com.lacey.dabump