Marimba

I think marimba and xylophone are different instruments because they have different structure and different sounds. So i should to describe xylophone at 1st because it's much simplier, but i haven't time now to search information about it so i describe marimba.

Some information from Wikipedia:

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, an instrument whose ancestor was a type of balafon that African slaves built in Central America.

Modern uses of the marimba include solo performances, woodwind ensembles, marimba concertos, jazz ensembles, marching band (front ensembles), drum and bugle corps, and orchestral compositions. Contemporary composers have utilized the unique sound of the marimba more and more in recent years.

When playing the marimba it is preferred to strike just off center or right on the edge (for the "black keys") for the fullest tone, while striking the bar in the center produces a more articulate tone. Playing on the node (the location where the string passes through the bars) is sonically very weak, so it is only used when the player or composer is looking for that particular muted sound.

Part of the key to the marimba's rich sound is its resonators. These are metal tubes (usually aluminium) that hang below each bar. The length varies according to the frequency that the bar produces. Vibrations from the bars resonate as they pass through the tubes. In instruments exceeding 4½ octaves, the length of tubing required for the bass notes exceeds the height of the instrument.

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Gemshorn

This is a variant of such instruments as an ocarina and a recorder made from animals' horns.

Some information from Wikipedia:

The gemshorn is an instrument of the ocarina family that was historically made from kirby gemsbok, chamois, goat, or other suitable animal. The gemshorn receives its name from the German language, and means a chamois horn.

The gemshorn was in use in the 15th century. Examples have been unearthed in Italy, in Hungary and in Germany, including one intact instrument made of clay which dates at least to 1450, as it was found buried beneath the foundation of a house built at that time. The early history of the instrument is not well known, but the oldest known illustration of one in a reference work is in Musica Getutscht (1511), by Sebastian Virdung. A skeletal figure is seen holding one in a Danse Macabre illustration dated to 1485. There is also mention of this instrument in "The Complaynt of Scotlande" as "ane gatehorn"(goat horn). Volume 2 of Praetorius's "De Organographica", from the early 17th century, provides detailed construction plates and diagrams for the gemshorn. They were primarily a pastoral instrument and were not widely known after the mid-to-late 16th century. With resurgent interest in early music in the 19th and 20th centuries, they have received new attention. Horace Fitzpatrick developed a form of gemshorn which adopted the fingering method of recorders and produced them in consort families, which have proven very popular since the 1960s.

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