https://youtu.be/-b5WsEDZvsEListen to the game of the 1-2-3 in Tsaikovki's 1 St piano concerto 1st movement for the dialogue play of who is on 1st, 2cond and 3rd in the 2cond movement
Listen to the dissention between romantic and classical idioms here.:
Then the striving for the 5th in the second movement again
And the 9th in the 3rd movement.
https://youtu.be/ppJ5uITLECE