One Music is an app that synchronises the music play in multiple iPhones. Also, it can work as a stand-alone music player.
+ Good synchronisation of song play with upto 3 devices
+ Access, download & listen to SoundCloud songs
+ Create playlists for selected songs
+ Set your favourite songs
+ Access songs by Artists, Genre
+ Create groups
+ Can access group history
Many songs! Many playlists! Many people! One Music!
With Family Sharing set up, up to six family members can use this app.