I beleive you can use a small sample of the music without having to pay royalties
Fair use. A person running for political office used 15 seconds of his opponent’s campaign song in a political ad. Important factors: A small portion of the song was used and the purpose was for purposes of political debate. (Keep Thomson Governor Comm. v. Citizens for Gallen Comm., 457 F. Supp. 957 (D. N.H. 1978).)
but the fact is they bands don’t object to the music being used they oppose a rebulicans using it..