Osho...

"When you become deeply engrossed in something, all of a sudden you will hear a sort of music ringing within you. This is the music of peace. At times when you are listening to good music this absorption can happen. You forget yourself for a moment; for a moment the past and future disappear and you are drowned in the sweet sound of music. Live in the present and you will experience that moment of peace all around you: at times such a moment comes in love, at times in the beauty of nature. These are the moments you experience peace."

Osho, The Great Secret Chapter 9, Relax in Joy