Acellone is a largecello invented in 1882 by the GermanluthierAlfred Stelzner. It is held like a cello buttuned (high-to-low) to E3 A2 D2 G1, afourth below the cello and twooctaves below theviolin. Its music is written in thebass clef. Its body length and its breadth slightly exceeds those of a normal cello, but it sounds much deeper than a normal cello.[1][2]
It is rarely used bycomposers. One of the few works where it is used is the Sextet in D major for violino piccolo, violin,viola,violotta, cello, and cellone,Op. 68, byArnold Krug.[3]