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
Hurdy-gurdy to the melody, resulting in a sound similar to that of bagpipes. For this reason, the hurdy-gurdy is often used interchangeably or along with bagpipes, particularly in Occitan, Catalan, Cajun French and contemporary Asturian, Cantabric, Galician, and Hungarian folk music. Many folk music festivals in Europe feature music groups with hurdy-gurdy players. The most famous has been held since 1976 at Saint-Chartier in the Indre "département" in Central France. In 2009, it relocated nearby to the at La Châtre, where it continues to take place during the week nearest July 14 (Bastille Day). The hurdy-gurdy is generally thought to have