Chris Willman Music WriterIf you’re one of those people who think music has lost its dangerous edge, Sacha Baron Cohen had the cure for that in “Borat Subsequent Moviefilm.” Taking on two levels of disguise in the 2020 sequel, Cohen again played his fictional Borat character, who in turn disguised himself for a key sequence in the movie as Country Dave, a singer who shows up to perform a song called “The Wuhan Flu” at a right-wing militia rally.