string quartets op.18/1 & op.127 String quartets op.18/1 & op.127 string quartets op.18, no.3&6 string quartets opp.127 & 132 string quartets opp.51 & 105 string quartets nos. 1 & 2 string quartets nos.14 & 15 String Quartets op.18, No.3&6 string quartet op.59 no.2 string quartets nos. 21 & 22