These two catalogued works, Hess 315 and Hess 316, are part of Beethoven’s lesser-known and unfortunately lost compositions. The Hess catalogue, compiled by Willy Hess, includes works that were either unpublished, incomplete, or lost over time.

• Hess 315 likely refers to a fugue composed for solo piano, a form Beethoven admired for its contrapuntal rigor. Though the manuscript is lost, references to it suggest it may have been an exercise or sketch from his late period.
• Hess 316, a quintet, could have been written for a combination of strings and winds, possibly similar to his early Quintet Op. 16. Again, no score survives, but its mention in catalogues implies Beethoven explored ensemble textures beyond his published works.

These lost pieces remind us of the vast creative output Beethoven left behind—some of which remains a mystery. Scholars continue to search archives and private collections in hopes of uncovering sketches or references that could shed light on these enigmatic entries.