Madonna doesn't so much reclaim as reassert her pop throne on "Rebel Heart," online and in stores today. It's a complex, consistently strong album -- her most vibrant since 2005's "Confessions on a Dance Floor."

It leaked in full weeks ago, uncovering collaborations with Kanye West, Diplo and Avicii. But it's Madonna herself who makes for the most convincing moments. The album is full of contrasts: defiance and submission, strength and vulnerability, sex and loss. She shifts easily from lush dance grooves to wistful ballads.

She also references past works in sound and lyrics. But Madonna's most effective moves aren't looks back. She's at her best hopping on current trends and flipping them to fit her own vision. At its frequent best, "Rebel Heart" showcases her enduring pop power.

South Beach nightclub celebrates the pop icon at its annual Madonnarama, an evening of nonstop Madonna songs and videos. It happens 9 p.m. April 18 at 810 Pacific;