She dances on the line between clever self-referentiality and less inspired rehashing on her new LP, committing to the over-the-top excess that first made her a star.

“Mayhem” puts the lie to that idea: Brash, squirmy, full of detailed grooves and expertly crafted hooks, it’s a winning reclamation of her trademark sound — her best since 2011’s “Born This Way” and precisely the album you’d want her to drop before headlining Coachella, as Lady Gaga will do next month.