sentences:  In only four other piano concerti by Mozart are the slow movement in a minor key (K. 271, K. 456, K. 482, and K. 488).This concerto also opens in triple meter, an unusual feature of Mozart's 27 Piano Concerti; only K. 41, K. 413, K. 491, and K. 449 open in triple meter.The first and third movements are based on ones by Honauer (Op.