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 is especially characteristic of French instruments. By the end of the 17th century changing musical tastes demanded greater polyphonic capabilities than the hurdy-gurdy could offer and pushed the instrument to the lowest social classes; as a result it acquired names like the German "Bauernleier" 'peasant's lyre' and "Bettlerleier" 'beggar's lyre.' During the 18th century, however, French Rococo tastes for rustic diversions brought the hurdy-gurdy back to the attention of the upper classes, where it acquired tremendous popularity among the nobility, with famous composers writing works for the hurdy-gurdy. The most famous of these is Nicolas Chédeville's "Il pastor Fido", attributed