stuartk, A suggestion for you in your search. Rather than trying to find a composer which might prove difficult as their body of music can be vast and very different piece to piece, if you pick a sour one it might be least representative of his other works, you can try getting compilations of works by pianists and labels in which you will discover a lot of diversity which would otherwise elude you. I would recommend if you chose this method to start with recordings from Steinway & Sons (and Jenny Lin). For some other current pianists who do compilations, i.e. programs as you would hear in concert, you could try Stephen Hough, Imogen Cooper, and Yuja Wang. BTW, Beethoven’s music for solo piano is profound and worth some listening effort, and if interested, Bavouzet has a worth while set out that I like. This is meat that sticks to the bones! but maybe for a bit later perhaps.
BTW, I love Jazz - I got started exploring this by listening to side men on recordings that I liked (as well as other recordings by the principle performer. Started with Evans, Peterson, Getz, Previn, etc. My only complaint about a lot of jazz from the 50’s thru 70’s is ’drums’. I like them live but not so much in my home. Jones, Jamal, and Jarrett, Peterson are my go to pianists. And I love Charlie Haden’s recordings, all of them!
Have fun.