String quartets nos. 1 & 2 String Quartets Nos. 21 & 22 String quartets Nos. 1 & 2 string quartets nos.14 & 15 string quartets nos.2 and 4 string quintets no.1 & 2 String quartets nos. 1-3 String quartet no. 1, op. 20 String quartet no. 2 1955 String quartets opp. 12 & 13