Tonal effects produced by striking a device, usually of fixed pitch or tonal character (as opposed to tunable piano strings, etc.). Two types: 1. Tuned percussion with a series of units, each tuned to a corresponding note in a piano or organ scale. Examples: xylophone, orchestra bells, chimes. 2. Non-tuned percussion such as a cymbal, bass drum, snare drum, tambourine, tenor drum, triangle, wood block, etc., which have no specific pitch. In automatic musical instrument terminology, tuned percussion are usually listed individually. Non-tuned types are often grouped together as "percussion" or "drum and trap effects."