Piano sonata in B-flat major, K. 281 Piano Sonata in B flat major, K281 Piano sonata in B flat major, D. 960 Piano Sonata in B flat major, K. 570 Piano Sonata in E flat major, K282 Piano sonata in B flat major, K.333 Piano sonata in B flat major K 570 Piano sonata in B flat major, D960 Piano sonata No. 3 in B-flat major k 281 Piano Sonata in B flat major, D960