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Black Eyed Peas frontman will.i.am, Tiësto, Passion Pit, Groove Armada and Major Lazer are among the first acts confirmed to headline the 2010 Ultra Music Festival, the top outdoor festival for electronic music fans. This year's fest will close out the 25th annual Winter Music Conference on Mar. 26 and 27 in Miami, Fla.

Additional performers slated for the two-day event at Bicentennial Park include Deadmau5, Faithless Sound System, Carl Cox, Armin Van Buuren, the Crystal Method, the Disco Biscuits, Diplo, and A-Trak, with more names to be announced in the coming weeks.

Tickets for Ultra Music Festival, on sale now at ultramusicfestival.com, are $139.95 for two-day general admission and $350 for two-day VIP admission.

Here is the full initial lineup for Ultra Music Festival:

Friday, March 26

Tiësto
Swedish House Mafia
Passion Pit
The Crystal Method
The Disco Biscuits
Carl Cox
Dirty South
Will.i.Am
Rabbit in the Moon
Infected Mushroom
Plump DJs
Felix da Housecat
Pretty Lights
Adam Freeland
Green Velvet
Alex Metric
Lotus
Uberzone vs. Bassbin Twins
Dan Black
Evil Nine
Kevens
Afrobeta

Saturday, March 27

Deadmau5
Groove Armada
Carl Cox
Faithless Sound System
Armin Van Buuren
Above & Beyond
Crookers
Bloody Beetroots
Ghostland Observatory
Major Lazer
Bassnectar
Steve Aoki
ATB
Glitch Mob
Diplo
LTJ Bukem
A-Trak
Rusko
Banga
Skream
Caspa
Toddla T