A Mournful Rustling by Otter (32K)
Gen, Seasons 5-7 spoilers, a mood piece somewhat related to Orpheus
Usually, I wouldn't recommend something that's more a mood piece than a story, but I found this one very appealing.
The songs in Daniel's head while he's dealing with Dr. MacKenzie charmed me enough to keep reading, and I was drawn in. The fic's title is apt.