
1) Bowed instrument 2) Contrabass instrument
Found on
https://www.crosswordclues.com/clue/octobass

The octobass is an extremely large bowed string instrument constructed about 1850 in Paris by the French luthier Jean-Baptiste Vuillaume (1798-1875). It has three strings and is essentially a larger version of the double bass (the specimen in the collection of the Musée de la Musique in Paris measures 3.48 meters in length, whereas a full size do...
Found on
http://en.wikipedia.org/wiki/Octobass
No exact match found.