My brother is entering a competition, which the final round requires a performance of a Piano Concerto of any era. My brother is looking for an emotional and powerful piece. I recommended a late Romantic piece for him. He has found Rachmaninoff's Piano Concerto No.2 and Addinsell's Warsaw Concerto exceptionally interesting, the later in particular. The problem, however, is that even though Warsaw Concerto does feature a piano as a soloist, we are unsure whether it is a Piano Concerto or not.
P.S. If any of you happens to know a great Piano Concerto of similar style, please do tell me.