First off, unfortunately for monitors in the Mid-TN area NORAD pretty much ignores this area. No, there are never any fighters scrambled over Nashville for any stray aircraft. Matter of fact this area is SO ignored by the dept of defense when the President comes to town a CAP is not even established. And also since this area is so ignored their are no such things as an unidentified a/c. Nope, Nashville is wide open to an aerial assault since their are no fighter coverage within 500 or so miles. Prob the closest is Montgomery, AL but they would do no good as their too busy "playing" in the MOA's in S AL for the Alabama and Georgia monitors to here.
The only fighters i ever here are with ATC (mostly Navy) and they are either way North of Nashville or way South never right over the top. And thats only for cross-country flights from one Navy base to another more inland. And they are unarmed for the most part. You left a military hotbed my friend, a hotbed that will never be found in Middle Tn. Now after all the above truth, the only NORAD freq you might hear in this area is 364.2 and thats usually a AWACS passing thru or maybe a Jstars and they're mostly radio checks. Then they go silent. Sorry to break the news.