Silence and sound are not two separate things. Sound seems to be surrounded by silence to a mind that moves in time and sees objects in relation to their opposites. Sound is silence sounding. Silence is No-Thing. It has no qualities what so ever. What we think of as silence and empty space are the same. This No-thing is filled with everything and they are one and the same. The mind will always look for something as Nothing constantly points to our own absence. Hence the search goes on (apparently) searching for something when what’s looked for is No-thing.