Sinnravians are a civilization native to the Alpha or Beta Quadrant planet Sinnrav.
They are primarily renowned for their music, in particular, Sinnravian drad music, which is considered unpleasant by many other races.
The son of Captain Janna Demitrijian lived with a Sinnravian girlfriend on Canopus Planet in early 2376. (SCE - Miracle Workers eBook: Cold Fusion)
Sinnravian musicians performed at a function at the Federation Embassy on Qo'noS sometime prior to late 2376. (KE novel: A Burning House)