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 from the French, and players generally need to know these terms to read relevant literature. Such common terms include the following: According to the Oxford English Dictionary, the mid 18th century origin of the term "hurdy-gurdy" is onomatopoeic in origin, after the repetitive warble in pitch that characterizes instruments with solid wooden wheels that have warped due to changes in humidity or after the sound of the buzzing-bridge. Alternately, the term is thought to come from the Scottish and northern English term for uproar or disorder, "hirdy-girdy" or from "hurly-burly", an old English term for noise or commotion. The instrument