String quartet no. 12 in E flat, op. 127 String quartets No 12 in E flat, Op. 127 String quartet no. 12 in E-flat major, op. 127 String quartet No. 12 in E-flat major op. 127 String quartet no. 1 in E flat major, op. 12 String quartet no. 15 in A minor, op. 132 String quartet no. 16 in F major, op. 135 String quartet no. 16 in F, op. 135 String quartet no. 2 in A minor, op. 13 String quartet no. 6 in B flat, op. 18 no. 6