Loading music assets. Phaser

audioInfo.js

// Load the music in 2 different formats, in the preload function
game.load.audio('music', ['assets/music.ogg', 'assets/music.mp3']);

// Add and start the music in the 'create' function
// Because we want to play the music when the play state starts
this.music = game.add.audio('music'); // Add the music
this.music.loop = true; // Make it loop
this.music.play(); // Start the music

// And don't forget to stop the music in the 'playerDie' function
// Otherwise the music would keep playing
this.music.stop();