The universe is nothing but a group of frequencies. Everything has frequencies. Sound is one of the original sources of creation. Everything is sound. Water particles are reshaped by the frequencies of sound. Remember that our bodies contain 75% of water. So, we need to be carful of what we listen to frequently, and we should know the  frequency levels that run through our brain. What we listen to is a refection of our behaviors and attitudes. What we listen to is the energy that we produce.