This is a question which for too many pianists leads to such answers as:
- I’m working on Allegro, but it’s not yet ready to play;
- I finished learning Andante last month, but I’ve forgotten it now;
- I don’t have my music books with me, so …
What a pity!
The reality is that too many of us can’t sit down at the piano – without notice, without notation, and without embarrassment – and simply play something!