String instrument strings, or play them by rolling the bell of a brass instrument such as a trombone on the array of strings. However, these are relatively rarely used special techniques. Other keyed string instruments, small enough for a strolling musician to play, include the plucked autoharp, the bowed nyckelharpa, and the hurdy-gurdy, which is played by cranking a rosined wheel. Steel-stringed instruments (such as the guitar, bass, violin, etc.) can be played using a magnetic field. An E-Bow is a small hand-held battery-powered device that magnetically excites the strings of an electric string instrument to provide a sustained, singing tone reminiscent
Music of Switzerland of folk music was the Swiss song Kühreihen, an agricultural Alpine song in the Lydian mode. Traditional instruments included alphorn, hammered dulcimer, fife, hurdy-gurdy, castanets, rebec, bagpipe, cittern and shawm. At the beginning of the 19th century, Swiss folk music was largely performed by ensembles made of itinerant musicians and solo acts using an instrument, with only a few duos. In the 1830s, however, the Swiss military was reorganized, leading to the formation of brass bands that used modern instruments. These instruments, mostly brass or wind, were built much better than those played by itinerants, and musicians brought them back