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
Experimental musical instrument the "Bowafridgeaphone" (bow a fridge a phone). Leila Bela is an Iranian-born American avant-garde musician and record producer from Austin, Texas. The Japanese multi-instrumentalist and experimental musical instrument builder Yuichi Onoue developed a two string hurdy-gurdy like a fretless violin, called the Kaisatsuko, as well as a deeply scalloped electric guitar for microtonal playing techniques. Solmania from Japan, and Neptune are noise music bands that built their own custom made guitars and basses. Solmania modifies their instruments with extra droning strings. Neptune built guitars out of scrap metal and make electric lamellophones. The bass is built using a VCR casing