小号，铜管乐器家族的一员，常负责旋律部分或高吭节奏的演奏，也是铜管乐器家族中音域最高的乐器。常用于军乐队、管弦乐团、管乐团、爵士大乐团或一般爵士乐，视曲目编制需求而有不同。

近代最常见的小号为降B调小号，亦有C调、D调、降E调、E调、F调、G调和A调的小号，与其他铜管乐器相比，小号的音域相对狭窄。而管弦乐团中，因小号为移调乐器，小号谱为方便阅谱都会移调(Transposing)为Bb调；C调小号在一般乐团较为常见。而C调的小号管身较短，吹出的音色较嘹亮。

A trumpet is a musical instrument. It has the highest register in the brass family. As a signaling device in battle or hunting, trumpets have a very long history, dating back to at least 1500 BC; they have been used as musical instruments since the 15th century. Trumpets are used in art music styles, where they are an instrument in the orchestra and in concert bands, and in popular music styles such as jazz. They are played by blowing air through almost-closed lips, producing a "buzzing" sound that starts a standing wave vibration in the air column inside the instrument. Since the late 15th century they have primarily been constructed of brass tubing, usually bent twice into a rounded oblong shape.