What is this piece?

[hypehuman]

I played a piano piece many years ago, but I can't remember the name of the piece, nor the composer's name.  I went into Finale and put together what I remember of it; I know I don't have all the notes in there and I skipped a lot of parts, maybe even made some up.  But if anyone knows what this piece is, I would be very grateful, as I would like to get it back into my repertoire.  I have attached it as a .pdf an as a .mp3.  The first two lines are pretty boring, but it gets more fun after that

Thanks!

[rob47]

Chopin
Prelude in D Flat Major, Op 28 No 15.

cleverly transposed to c major

[Bob]

Raindrop?

[hypehuman]

Yes, C Major is my friend

Thanks, both of you!  I think the last first time I tried to learn this piece I didn't have enough experience to do it properly, but I think I'm ready to have another go at it.  I just watched it on youtube and it's even more lovely than I remember it.