Unless you're a musician, or particularly observant, you don't notice The Sound Guy. But if he weren't there, you'd notice his absence. A good soundman balances the volume levels and adjusts the equalization (basically, treble and bass) of every instrument's amplification. He is also responsible for something you don't hear, but which makes a huge difference in the quality of a performance: He adjusts the same things on the monitor mix, or the sound that the musicians hear on stage. A band on stage without good monitors can't hear each other, can't even, often, hear themselves. Which means they can't tell how they're playing. And at that point, you don't want to hear it, either. A bad so