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 Sweden fiddle with two sympathetic strings, similar to the Norwegian Hardanger fiddle The nyckelharpa (keyed fiddle) is similar to both a fiddle and a hurdy-gurdy, and is known from Sweden since at least 1350, when it was carved on a gate in a church in Gotland. During the 15th and 16th centuries, the nyckelharpa was known throughout Sweden, Denmark and particularly in the province of Uppland. The latter has long been a stronghold for nyckelharpa music, including through the 60s revival, which drew on musicians like Byss-Calle from Älvkarleby. The instrument played at this time was not the same as that