This may be a tough one to answer, considering the difficulty in describing music in a text-based medium. Also, I’m not musically literate, so I can only describe the piece in layman’s terms. About the only thing I can say with certainty is that it’s Mozart; that I remember for sure.
It’s about 20-25 minutes long. The title is something like “Piano Concerto in [Key] K. [Number].”
The beginning few bars are quiet and low - deep stringed instruments (like the viola?), I believe. It sounds something like this: “do-do do do do DOOOOOOOOO, dododo.”
A couple bars later, the higher stringed instruments (violins and such) come in. A long “DOOOOOOO” while four shorter “do’s” play under it, then four short “do’s” again, with four more under it.
This goes on for the first couple of minutes, and then the piano comes in.
The piano is the star of the show, and its part consists of long, complicated sequences of notes in quick succession (which, I know, is every piano part ever, but that’s the best I can do).
The piece builds to a loud, jubilant, full orchestra hitting a giant crescendo, not unlike “The Barber of Seville” overture (stylistically that is).
Is this ringing a bell for anyone?