JLayer
http://www.javazoom.net/javalayer/javalayer.html
JavaからMP3を扱うことができるライブラリ。音を鳴らすだけなら、↓みたいな感じに書けばOKらしい。
FileInputStream ins = new FileInputStream("gunbuster.mp3"); AudioDevice device = FactoryRegistry.systemRegistry().createAudioDevice(); Player player = new Player(ins, device); player.play();