What it sounds like, and the records to hear it on.
The marimba (also: marimbaphone) is a musical instrument in the percussion family. Keys or bars (usually made of wood) are struck with mallets to produce musical tones. The keys are arranged as those of a piano, with the accidentals raised vertically and overlapping the natural keys (similar to a piano) to aid the performer both visually and physically. The chromatic marimba was developed in southern Mexico and northern Guatemala from the diatonic marimba .