Soudwave is the best app you have probably not heard about. Soundwave lets you share all the music that you listen on any music app on your phone. Yes, you provide the permissions for you to let it share the music you listen. There is no copyright problem here because the app is not exactly selling any song in that one owns or even streaming it.
It just shares what you have been listening in a private group chat. You start following people and people can follow you. You can then get discover endless music and playlist by the world that has been using Soundwave. With Soundwave you can share your music from the 1st party music app in the phone, Spotify, Pandroa, Soundcloud, Rdio and a lot more places.
Soundwave is the biggest platform to share and discover music. It is rightfully called the Instagram of music. Apart from the sharing music, it acts like a basic messenger where you can chat. But remember this is a music community and you are here to discover awesome music.