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[Gokudera's getting a little flustered with all the questions, and being pushed along the bench doesn't help much. The rich little Italian boy has never been pushed, and his expression shows just how unamused with that he is. But he was asked questions, and he knew he ought to be polite and answer them]
A note is just a different word for a pitch. A sound that the key makes. The piano has low notes [He pushes down a key on the left side of the piano] and high notes.. [A key on the right side is pushed] They go in order from low to high, but you have to practice a lot to remember which ones are which. And the black ones are half-steps, notes that are in between the white keys.