glockenspiel, crotales, and tubular bells), and the "rack-tronics" (e.g., the electronics, timpani, and non-pitched percussion). A typical front ensemble is made up of about 13–18 players: Pitched Percussion 4–6 Marimbas 4–6 Vibraphones 1 Glockenspiel 1 Xylophone 1 Set of Timpani (4 or 5 drums) Non-Pitched Percussion 0–1 Drum Set 0–2 Percussion Racks Electronic Instruments 1–2 Synthesizers/Samplers See also Marching percussion Technology in Drum Corps International References Percussion ensembles Marching bands