String Quartet in B flat major,Op.130 String Quartet in E flat major, op.109 String Quartet in B flat major,op.67 String Quartet in B flat major,Op.103 String Quartet in E flat major,Op.127 String Quartet in E flat major, Op.127 String Quartet in B flat major op. 67 String Quartet in B flat major,K.159 String Quartet in B flat major,K.172 String Quartet in E flat major,K.171