Several times a day, stop and just listen. Open your hearing 360 degrees, as if your ears were giant radar dishes. Listen to the obvious sounds, and the subtle sounds—in your body, in the room, in the building, and outside. Listen as if you had just landed from a foreign planet and didn’t know what was making these sounds. See if you can hear all sounds as music being played just for you.
Even in what is called silence there is sound. To hear such subtle sound, the mind must be very quiet.
From How to Train a Wild Elephant and Other Adventures in Mindfulness by Jan Chozen Bays, MD, pages 49–51