Franz Xaver Scharwenka: Piano Concerto No. 4 in F Minor
This is an absolutely phenomenal (and basically completely unknown) piano concerto by German-Polish composer Franz Xaver Scharwenka. If you've got nothing to listen to for the next 43 minutes, you can't go wrong with this.
Performed by pianist Francois Xavier Poizat, with the Poznan Philharmonic Orchestra under Lukasz Borowicz: