This is a chart of stringed instrument tunings. Horsehair is used for violin and other stringed instrument bows. A fret is a raised element on the neck of a stringed instrument. Sunder has interest in playing Indian stringed instrument the Veena. A plectrum is a small flat tool used to pluck or strum a stringed instrument. Slapping and popping are ways to produce percussive sounds on a stringed instrument. The word derives from the Italian "capotasto", which means the nut of a stringed instrument. Apollo is shown with his lyre, or sometimes a harp, viol or other stringed instrument. They are "qin" (the guqin, a stringed instrument. "Pattupattu" contains a description of the "yazh", a stringed instrument. He was also a founder of National Stringed Instrument Corporation and Rickenbacker (originally Rickenbacher) guitars. The lute was the most popular stringed instrument. Occasionally on a guitar, violin, or other stringed instrument, nodes are used to create harmonics. He is known for designing the first electrically amplified stringed instrument to be marketed commercially. The "shamisen" is a plucked stringed instrument.