on the piano与to the piano

有一读者问: 有这样一道选择题:

(1)I'll get Bill to accompany me_________the piano when I sing a song at the concert.

A. by B. with C. on D. to

标准答案为C,其解释为“乐器名称前用介词on,句中意指用钢琴伴奏”。

但我在《新英汉词典》中看到to也有“随同,伴随”之义,其例为sing to the piano。究竟哪项选择正确?

accompany somebody on the piano(为某人用钢琴伴奏)中的介词on意指“利用”(by means of, using),再如:

(2)He will accompany me on the piano .

sing to the piano(钢琴伴唱)中的介词to则意指“伴奏”或“唱和”(in accompaniment with),实例如:

(3)He sang to the piano .

(4)They danced to the music of a piano .