string quartets opp.34 & 96 string quartets opp.51 & 105 String quartets opp. 12 & 13 string quartets nos.14 & 15 string quartet op.33 no.3 string quartets opp.95 and etc. String Quartets opp.127 & 132 String quartets nos. 1 & 2 String quartet op. 6, 1 String quartet op. 6, 2