OM -The Sound of Universe. OM mantra chant and meditation on the symbol are believed to bring health, prosperity, happiness and longevity to the spiritual aspirant. The sound of Om sustains life. Om also represents the four states of the Supreme Being. The three sounds in Om (AUM) represent the waking, dream and deep sleep states and the silence which surrounds Om represents the "Bliss" state.
Listen to this 55 Minutes of soothing OM Mantra chant music. Original Youtube link here