After Amy sent me The Hard Lick movie in July, as a text (I was on a commuter rail train at the time), I texted back, "yeah, but what about the first six pages?" That's really hard, and relentless.
Minutes later, this one came back in a text. Which, later, I edited all the page turns out of. So this is what the piano does in the concerto for the first three and change minutes before it gets a break. The next thing it does after a half minute break is pluck a note. So there.
Yes, the orchestra plays and interjects during this music. Imagine it.
And here is the sketch of the opening several bars.