Jeb, going by his merc name "Snake," has been dropped into the Hurricane Katrina Zone on a mission to slay his evil half-brother George. Snake shakes down rattled, frightened storm victims for info about the renegade president, but the two Bush boys keep missing each other as they wander the tangled swamps. George, free of both his kidnapper and the treacherous hussy Michael Brown, is feeling footloose and fancy-free -- until he runs into a clutch of storm victims himself. George's helpless arrogance seals his fate as the ravaged, angry survivors respond to him not with fear but with righteous wrath... which eventually erupts in a flashpoint of violent mob vengeance. Hence the title.
As for music, there's at least a great version of "Bad Moon Rising" by 16 Horsepower, some Peter, Paul, & Mary for the ones who are all folked up, "Roll the Bodies Over" by Stump (I think), and an oldtimey gospel hymn called "Echoes from the Burning Bush" -- for obvious reasons.