While preparing for a Vocal Lit class at the Glenn Gould School last week I found just one of those buried treasures: a 1907 setting of Verlaine's Clair de lune by Polish/French composer and conductor Joseph Szulc. Although the Fauré and Debussy settings are far more well known, Szulc's setting has an undoubtedly French intimacy and sensuality that stands up to the other versions extremely well.
There are only a handful of recordings I could find, most of them on YouTube. Here is one by an unknown (French?) baritone with a likewise unknown pianist:
This vinyl recording is sung by Maggie Teyte, with Gerald Moore at the piano:
The sound on the Teyte/More recording above isn't very good, but you can get a better account of it on this Naxos release. If you're looking for a score of this singular Clair de lune setting, there's a free one on IMSLP (thank you again, Sibley Library!).