Prokofiev?

Yesterday, spontaneously, Madison went to the piano and was working on something for some time, with the headphones on. Then she went upstairs to her computer and worked on something on it for another long time.

Then she printed what she had, and it turned out to be a kind of composer's note to herself to remind herself of the storyline of the musical composition she had created. Here are the notes:

Once upon a time

M

The princess is coming (repeat 3)

I am not .... she is not content

I need a prince ..... Find a prince

A party

M

A true love at last

The only thing she would reveal about it is that the M stands for music.

She told her piano teacher all about it this morning. But none of us have heard it. She always has the headphones on.