Will.I.Am, David Guetta, Tiesto Rock Ultra Music Festival At WMC 2010

LMFAO, Will.I.Am guest during Guetta's set.

MIAMI -- Dance music's biggest weekend in America kicked off with a series of powerful performances at day one of the Ultra Music Festival (held during the Winter Music Conference) at Miami's oceanfront Bicentennial Park. With a multitude of stages (and even a Heineken-inspired dome), the weekend's lineup is probably UMC's largest and most star-studded grouping yet, boasting over 200 DJs from around the world and the likes of Swedish House Mafia, deadmau5, Armin van Buuren, Tiësto and David Guetta.

Over at the UMF Ibiza Stage, both [article id="1634810"]Kaskade[/article] and [artist id="1521450"]Will.I.Am[/artist] dropped new material for fans -- Kaskade from his forthcoming Dynasty LP and Will.I.Am for undetermined releases.

"I think it's important to come out to WMC to test out the new beats you've been making -- rockin' the crowds, learning from the crowds," Will told MTV News Friday night, just before he took the stage again to join a close friend.

Indeed, Black Eyed Peas collaborator and dance-music titan [article id="1634343"]David Guetta[/article] put on what seemed like a hip-hop collab fest, being joined by many friends on the Ultra main stage during the course of his set. He whipped the crowd into a frenzy with his thumping "Gettin' Over" before transitioning into "One Love." Will jumped onstage for "On the Dancefloor," then Guetta charged into a series of his hits, including the Lil Jon/ DJ Chuckie remix of "Sexy Chick" and BEP's "I Gotta Feeling." He ended up closing his set with a premiere of a new song called "Getting Over You" (featuring LMFAO), and sure enough, the party rock duo, who are currently on tour with BEP, joined Guetta onstage for his finale.

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Closing out the night at Bicentennial Park was Dutch trance heavyweight [article id="1634606"]Tiësto[/article], who had the thousands of fans in attendance clapping in unison for the majority of his nearly two-hour-long set. With pyrotechnics blasting, the crowd jumped to its feet, singing along with his Nelly Furtado collaboration "Who Wants to be Alone" and other hits from Tiësto's catalog, including "Escape Me," I Will Be Here" and "Love Comes Again."

Stick with MTV News for more coverage of the Winter Music Conference 2010 in Miami.