Finally someone mentions Scriabin's Piano Concerto! It's very difficult for me to choose just 5, so these are the concertos that come to mind at the moment.
I can't seem to order them, so these are not in any particular order.
Scriabin's Piano Concerto! (If you haven't heard it, listen to it, it is amazing! I highly recommend Anatol Ugorski's recording of it.)
Chopin's 1st and 2nd Piano Concertos.
Rachmaninoff's 2nd and 3rd Piano Concertos.
Grieg's Piano Concerto.
Gershwin's Piano Concerto.
Dvorak's Piano Concerto.
Bach's 1st Piano Concerto.
Brahm's 1st Piano Concerto.
Beethoven's 3rd Piano Concerto.
To name but a few. :-)
