Britney's slightest album ever suggests she wanted to check in on the EDM boom as a proud pop godmother despite having little to say at the moment. This is different from having nothing to contribute: the house-y pianos and synths of "Body Ache" continue the good work done with will.i.am on "Scream and Shout." (He also guests here on "It Should Be Easy.") And we might have Miley's "Wrecking Ball" to thank for "Tik Tik Boom" and the excellent "Perfume," two of her most solid ballads of late. Even "Til It's Gone" has a vulnerability missing from her tougher recent stuff.