For 10 points, name this string instrument that is larger than a viola but smaller than a bass.
Debussy wrote a sonata for this instrument in D minor, while Chopin's was in G minor and was one of nine works written by him not for the piano. In the tone poem by Richard Strauss, this instrument represents Don Quixote. Variations on a Rococo Theme was written for this instrument and an orchestra. Vivaldi composed many concerti for this instrument and Bach wrote six suites for this string instrument unaccompanied. Notable players of this instrument are Mstislav Rostropovich and Yo-Yo Ma. For 10 points, name this string instrument that is larger than a viola but smaller than a bass.
Debussy wrote a sonata for this instrument in D minor, while Chopin's was in G minor and was one of nine works written by him not for the piano.
violon{cello}