Simply slide your finger on every key so I know all your keys work, do the same for the flats as well.

Give a sweet melodic song

Now give me your most intense and greatest song you could play it needs to have a great tempo and sound like guitars and rock vocals can go with it. 

A good example for this type of stuff is songs from RWBY or the song Welcome to the Black Parade

 (DO NOT just bang on it, I've heard piano and I have had choir teachers play it before even for rock, so I know what it sounds like)