Scriabin concerto is very difficult IMO
This is an excellent choice if you like melodic non-dissonant 20th century music:
Concerto for Piano no 1 in F major, Op. 1
Composer: Geirr Tveitt (1908 - 1981)
Written: 1928
Country: Norway
Length - 20 minutes
If you want to hear the piece, there is a Naxos CD.
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If you're looking for a "modern" sound, take a serious look at Tcherepnin's 5th concerto. It's more difficult, however. If you want to hear the piece, there is BIS CD of Noriko Ogawa/Singapore symphony. Unlike many mid-late 20th century pieces, this concerto has enough melody to keep listeners engaged.
Concerto for Piano no 5, Op. 96 by Alexander Tcherepnin
Country of Origin: Russia
Written: 1963
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I have to disagree with the choice of Dvorak's concerto. I think it's really bland. It wasn't successful during his lifetime, and the Richter recording I have has no redeeming qualities.