Spouse told me of this. It looks like something Antifascists (cough Communists cough) would do. Set a bomb off to take notice but not hurt their fellow travelers. Nashville might be Music City but still enough trying to defy the governor in his unconstitutional lockdowns.
And/or it could be that they wanted it to go off later but the handler got spooked and set it off early.
it could be one of those warning bombings....maybe somebody has been given a warning....
afterall, our country seems to be leftists mafia centered...