Publisher Desc.  20 Quartets: Op.9 Nos.1, 3, 4, 5, 6; Op.17 Nos.1, 2, 3, 4, 6; Op.42; Op.50 Nos.1 5; Op.55 Nos.1 3; Op.64 No.1. Edited by Moser/Dechert.