Last March, attendees from 80 countries flocked to Miami for the annual Winter Music Conference. The legendary five-day event , which goes from March 23-27, will host some of the best parties of the year, informative panels with world-renown DJs, and of course, Ultra Music Festival.

The initial line-up for the music festival, taking place once more at Bicentennial Park, already includes A-Trak, Major Lazer, Steve Aoki, the Bloody Beetroots, and Pretty Lights. The added presence of Rusko, Skream, Bassnectar and Crookers is just another indication of how prolific dubstep has become in the music scene. Tiesto, Carl Cox, Dirty South, Rabbit in the Moon, Infected Mushroom, Deadmau5 and Armin Van Buuren were on the bill last year and will make repeat appearance in 2010.

A ticket to Ultra is included with the purchase of the Winter Music Conference badge, which is $325 if you purchase by January 6. On it’s own, a two-day pass to the festival costs $139.50.

Click through to view the complete list of the initial acts set to perform at Ultra, along with the official festival trailer. If the line-up wasn’t enough to get you psyched, check out photos from Ultra 2009 with Santigold, The Ting Tings, Armin van Buuren and Prodigy.

Stay tuned for our complete coverage of WMC – we’ll be posting info about the week’s best parties, panels, concerts, and more…

Ultra Music Festival 2010 Initial Line-Up:
[click on linked artists' names for photos of past events]