A piano quintet is basically a string quartet with added piano. Of course the combination poses challenges on its own, and there are not that many successful attempts. Dvořák himself tried it fifteen years earlier with his first piano quintet, opus 5. He was not happy with it though and destroyed the score.
This second quintet is born out of a desire to revisit his first. He managed to recover the score from a friend and started to work. During the work, his creative mind went to do its own thing, and a completely new piano quintet was born. A masterwork that can be measured against similar high points in the chamber music literature from Schumann, Brahms and Shostakovich. A beautiful recording to boot.