Fantasic improvisation

Mmm, there aren't "fantasic" in English? Maybe "fantastic" is correct?

I just begin to memorize "Fantaisie Impromptu" of Chopin.

Now I'm practicing "Für Elise" of Beethoven, so I've memorized the piece.
So, I thought I want to memorize other tune as my second practice composition.

Yeah, there are many many many good tunes I want to play, but, yes, haste makes waste.

I know, I know. :D