There are several ways to meditate with sound. Sound Vibrations have the ability to guide you to the centre. Chanting is one of these. Chanting a Mantra or a Shloka releases vibrations that are meditative. The chanting of OM with complete concentration is a complete meditation in itself. Similarly there is Qur'anic chanting in Islam and Buddhist chanting, which invoke a deep sense of peace. The sound has to surround and encompass you until you are one with it's resonance.
Tibetan singing bowl meditation.
