I added Punch Brothers to the review list because of Claire Coffee - Adelind on Grimm - because she is married to band member Chris Thile.
Punch Brothers are roots music, so at times you are reminded of country and folk without them ever being either. They definitely are old-timey, but their latest album, 2015's The Phosphorescent Blues, retains an interesting mix. I especially like the juxtaposition of a version of Debussy's "Passepied" with their "I Blew It Off".
I am nonetheless amazed at how much I hated their 2015 track "Sleek White Baby". I'm not sure if it is just a misfire, or a different product name would have worked better, but I strongly object to that song. For previous releases, try "Movement and Location" instead.
Punch Brothers are definitely a good fit for fans of roots music, and fans of bluegrass will probably enjoy as well.
You know who you are.