The glockenspiel is an instrument made of tuned metal keys placed alongside one another like piano keys. This percussion instrument is similar to a Xylophone but the keys of a xylophone are made of wood rather than metal. A marimba is a large xylophone style instrument with a series of metal pipes beneath each of the wooden bars or notes. These metal pipes act as sound resonators (pictured above). The sound from a glockenspiel is produced by a musician striking the metal keys with a mallet made of metal, plastic or rubber. Multiple keys can be struck at the same time using multiple mallets. The glockenspiel pitch is high so it is usually limited to music in the upper register. However, Virtual Piano provides the opportunity to transpose this sound and increase the Glockenspiel's range.