Trombone, also called pulling tube, is the only brass instrument without technical improvement in its structure. By sliding the tube, it can change the length itself and produce different pitches. The history of trombone can be traced back to the 15th century. It was called "Sackbutt" about 1700 years ago. In the 17th and 18th centuries it was widely used in such supernatural scenes as churches and opera houses. Then in the 19th century, trombone was listed as a fixed musical instrument in the symphony orchestra. For military band, trombone is always indispensable. Meanwhile it is used extensively for jazz band, known as the " King of Jazz ".
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