What is a Sound Clash? A Sound Clash is a musical competition where selectors and MCs from opposing sounds (two or more, but usually two) match wits in selecting, hyping up the crowd, and toasting (ridiculing the other sound's members). The object of the clash is to "kill" the other sound or sounds, leaving you the winner. It usually takes place in a large building or open arena (such as a skating rink or lawn), with the sounds set up at opposite sides, facing each other.