请大家帮我把这句中文翻成英语

Listen, someone is playing piano in the classroom.

首先,根据语境,在听的时候正在弹钢琴，所以需要用进行时态；
其次，play后面直接加上乐器名称，表示演奏这种乐器。中间绝对不能加冠词（a/an/the）。

Hear!Someone plays piano in the classroom

Listen!Somebody is playing the piano in the classroom.

Listening!there is someone playing the piano in the classroom.

Listen.Somebody is playing the piano in the classroom.

Hey,soneone is working on the piano.