In March 1824 Schubert composed his wonderful Octet for a mixed ensemble of ~ obviously ~ eight players. Four of these are on the already-standard String Quartet instruments (2 violins, viola and cello); which is the correct list of the other four?

While many of us love the pageantry of a great musical occasion ~ such as an oratorio, concerto or symphony concert ~ the intimacy of chamber music, played perhaps by a string quartet, has charms and powers of its own.