A cellone is a large cello invented in 1882 by the German luthier Alfred Stelzner. It is held like a cello but tuned (high-to-low) to E3 A2 D2 G1, a fourth below the cello and two octaves below the violin. Its music is written in the bass clef. Its body length and its breadth slightly exceeds those of a normal cello, but it sounds much deeper than a normal cello.