Welcome to the Wednesday, Sept. 5 edition of "The Beat," Billboard.com's daily music news show, featuring host Jonathan Brooks running down the latest music news -- who's making headlines and who's topping the charts.
In today's episode, J.B. dishes on the latest Hot Tours ranking  (which Madonna topped), Nicki Minaj's pro-Mitt Romney rap , the news that K-pop sensation Psy was signed by Bieber's manager  Scooter Braun, and Rita Ora's U.K. chart success . He also remembers Starship guitarist Mark Abrahamian, who died of a heart attack  Sunday.
Be sure to come back to Billboard.com  each weekday afternoon to watch a fresh episode of "The Beat."
- The Beat