Anything by Gottschalk!
O 
Yes! Gottschalk never gets the credit he deserves!
Favorite piece ever though?
Well, it's definitely by Beethoven. Waldstein? Lebewohl? Opp. 78, 109-111...
Then for not just solo piano, it would still be Beethoven. 6th symphony? Kreutzer? Archduke? Piano concertos? 9th symphony?
AHHH! Too much!
After Beethoven, anything Debussy, Chopin, Mozart, Haydn, Gottschalk, Joplin, Dvorak, etc., etc., etc...
And yes, this is all one piece!
