String Quartet in E flat major,K.428 String Quartet in E flat major,Op.127 String Quartet in B flat major,K.159 String Quartet in B flat major,K.172 String Quartet in E flat major,K.171 String Quartet in E flat major, Op.127 String Quartet in B flat major,Op.130 String Quartet in B flat major,Op.103 String quartet in E-flat major, G 236 String Quartet in B flat major,Op