I haven't played classical in a while... here are three pieces.

[nickc]

I rarely play classical piano anymore. But I gave Beethoven, Heller, And Rachmaninoff a go.... I purposely played with the tempos just to see how it would come out... I like it, but would love to hear your opinions

 

[essence]

Rachmaninov starts and ends well, but maybe gets a bit lost in the middle?

[seing1956]

Beethoven might sound more dramatic or even frantic at a faster pace, or incredibly weighty and profound slowed down. Heller's etudes, depending on which ones you played, could become more lyrical or even more technically challenging with tempo changes. And Rachmaninoff... well, his pieces are already so full of emotion, playing with the tempo could really amplify the intensity or create a completely different mood.