Artists confirmed, but no songs yet:

50 Cent
Bell Biv Devoe
Daft Punk
Jackson 5
The Killers
Queen
Rihanna

Songs known (29 of appx. 100):

-“Bittersweet Symphony” by Aranbee Pop Symphony Orchestra
-“Boom” by Grandmaster Flash
-“Boom Boom Pow” by Black Eyed Peas
-“Bustin’ Loose” by Chuck Brown & The Soul Searchers
-“Cars” by Gary Numan
-“Day ‘N’ Nite” by Kid Cudi
-“Eric B is President” by ric B. & Rakim
-“Feel Good Inc” by Gorillaz
-“Fix Up, Look Sharp” by Dizzee Rascal
-“Genesis” by Justice
-“Give It To Me” by Rick James
-“Here Comes My DJ” by Grandmaster Flash
-“Hollaback Girl” by Gwen Stefani
-“I Heard It Through the Grapevine” by Marvin Gaye
-“Izzo (H.O.V.A.)” by JAY-Z
-“Jack of Spades” by KRS-1
-“Jayou” by Jurassic
-“Lapdance” by NERD
-“Let’s Dance” by David Bowie
-“Monkey Wrench” by Foo Fighters
-“My Name Is” by Eminem
-“Pjanoo” by Eric Prydz
-“Rock the Bells” by LL Cool J
-“Rockit” by Herbie Hancock
-“Sabotage” by Beastie Boys
-“Satisfaction” by Benni Benassi
-“Shout” by Tears for Fears
-“Tap” by Grandmaster Flash
-“Time of the Season” by The Zombies

Mixes known (16 of appx. 80):

-“Bittersweet Symphony” vs. “Rock the Bells”
-“Boom” vs “Tap”
-“Boom Boom Pow” vs. “Satisfaction”
-“Bustin’ Loose” vs “Time of the Season
-“Day ‘N’ Nite” vs. “Boom Boom Pow”
-“Fix Up, Look Sharp” vs. “Genesis”
-“Here Comes My DJ” by Grandmaster Flash vs. “Cars”
-“Hollaback Girl” vs. “Give It To Me”
-“I Heard It Through the Grapevine” vs. “Feel Good Inc.”
-“Izzo (H.O.V.A.) vs. “My Name Is”
-“Jayou” vs. “Rockit”
-“Let’s Dance” vs. “Jack of Spades”
-“Monkey Wrench” vs. “Sabotage”
-“Rockit” vs. “Lapdance”
-“Shout” vs. “Eric B is President”
-“Shout” vs. “Pjanoo”

Link