 The second instrument is used in modern brass bands and marching bands, and is more accurately called a "marching mellophone" or mellophone.A derivative of the F alto horn, it is keyed in F. It is shaped like a flugelhorn, with piston valves played with the right hand and a forward-pointing bell.These horns are generally considered better marching instruments than regular horns because their position is more stable on the mouth, they project better, and they weigh less.