When you start the Beat Hazard 2 it will automatically search for any music on your phone. These need to be actual files copied to the phone, e.g. mp3 files etc. Unfortunately it's not possible for the game to support music from Steaming services such as Spotify.
Exploring You Music From the Main Menu select 'Manage Music' and the game will list all the tracks the game has found. The game will keep track of your high scores and you can also access cross platform leader boards for each song.
SHOUTcast Radio You can also play to hundreds of radio stations from SHOUTcast. From the Main Menu select 'Manage Music' -> 'SHOUTcast radio'. Top stations are listed. You can also explore stations by Genre by selecting the 'Genres' tab. Pressing the 'Heart' icon will add a station to your favorites.