18th19thadviceaugustbeckerbernhardbrevalcellistcellistscenturycervettocomposercounterpointduetduoearlyendetudesfrancegambagegenwartgermanygoltermanngrandhistoryhugointrointroductionitalyjosephjuliusklengelleelookmusiciansnolckoppiecesprojectpurposequarenghireadingrobertrombergschumannspecialtreatiseviolavioloncellistvioloncellistenvioloncellowasielewskiwomenyearyoung