Biscuits and Gravy - Nashville
Biscuits: You've gotta go to Loveless Cafe. Their biscuits are amazing (even if they are a bit stingy with them nowdays).
If you want to do a little biscuit mini-tour, there is another lesser known place further out Hwy 100 that serves a mean biscuit, too - The Beacon Light Tea Room.
Neither of these are even remotely near downtown.
8400 Highway 100, Nashville, TN 37221
Beacon Light Tea Room
6276 Highway 100, Bon Aqua, TN 37025