String Quartet in B flat major,Op String Quartet in E flat major,Op String Quartet in B flat major,op.67 String Quartet in B flat major String Quartet in E flat major, op.109 string quartet in b flat major, k. 458 String Quartet in E flat majo String Quartet in B flat major,Op.130 String Quartet in B flat major op. 67 String Quartet in B flat major,Op.103