I also admire Beyoncé because she hires lots of women singers and instrumentalists. Here she is on Letterman -- with an all-woman band. Brava! (And love the asymmetric dress detail -- could it be one of Tina's designs?)
You've seen HALO defined in connection with: a lunar glow ("Circle around the moon.") A video game. A saintly glow ("Good sign" or "Overhead light"). Beyoncé's song adds a new cluing angle to the mix.
Solver's Takeaway: Remember short song/album titles that can be clued in other ways. (EMILY, HELP, LAURA, DREAM, JUMP, WAR, FEVER, VENUS, TUSK, ONE, BAD, SMILE etc. -- can you think of more?) Don't let puzzlemakers trick you with stealth song titles!