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 Galicia, Cantabria and Asturias first recordings of the hurdy gurdy were by Galician Perfecto Feijoo in 1904. Harps had been used in the Middle Ages, but were not revived until the 1970s, when Emilio Cao used the instrument to accompany his compositions. Modern harpists have been encouraged by the use of the Celtic harp in Scotland, Ireland and Brittany, and include Quico Comesaña and Rodrigo Romaní. Percussion instruments include the "tamboril", a snare drum that hangs from the player's belt and is played with two sticks. It is small, natural-skinned and features snares made usually of gut. Along with the "bombo", a bass drum