In music, a march is a piece with a regular rhythm, written in such a style that it could accompany a marching procession. There are military marches, celebratory marches, and funeral marches, with the first usually being performed by wind and brass bands. They almost always include a steady percussion section. Marches can be written in any time signature, but the standard is 4/4, 2/4, or 6/8, with an average tempo of 120 beats per minute. Formally, they tend to repeat sections numerous times, modulating to the nearest keys (like the subdominant or the relative) and including counter-melodies during the repetition of a main melody.