Haydn was very influential to the young Beethoven, and much of early Beethoven bears a striking resemblance to late Haydn.
Not Trout. That's a quintet for violin, viola, cello, bass, and piano. I'm referring to the string quintet which is for two violins, viola, and two cellos. It's most often performed or recorded by an established string quartet that brings is another famous cellist to play the fifth part. It's a quite substantial work, around 50 minutes. It's definitely in the same realm as Death and the Maiden, but perhaps better.