string quartets opp.34 & 96 string quartets opp.51 & 105 string quartets opp. 12 & 13 string quartets opp.127 & 132 string quartets nos.14 & 15 string quartets nos.5 & 6 String quartets opp. 12 & 13 string quartets nos. 1 & 2 string quartet nos.1 & 9 string quartet op.33 no.3