You Hear It First
You Hear It First was an on-air MTV News program from 1999 to 2007 that gave the MTV audience a first look at hot emerging artists.  Past You Hear It First artists that went on to success include:  

Ye
Alicia Keys
Coldplay
John Legend
The Killers
The Pink Spiders
The Click Five
Bloc Party
Cute Is What We Aim For
Franz Ferdinand
The Game
Taproot
My Chemical Romance
Fall Out Boy
Rihanna
Ne-Yo
Chris Brown
Paramore
The Jonas Brothers
Robin Thicke
Sean Paul
Young Jeezy
Lily Allen
Joss Stone
Silversun Pickups
Arctic Monkeys
t.A.T.u.
Tally Hall
Fall Out Boy
Nightmare of You
Kaiser Chiefs
Cory Gunz
Tiffany Evans
Something for Rockets
Rise Against
AM Sixty
Whitestarr
Brie Larson
Rupee
The Blackout Effect
The Bens  (a supergroup consists of Ben Folds, Ben Kweller and Ben Lee)
Steve Burns
Acceptance 
Dropping Daylight
The Vines
Rosco P
Hidden Cameras
Stellastarr
Kings of Leon
Fefe Dobson
Kiley Dean
Little Brother
Fiction Plane
Jin
Earlimart
The Exies
The Beu Sisters
Interpol
Rooney
Idiot Pilot
Division of Laura Lee
Desaparecidos
Bazaar Royale
Lyrics Born
The Postal Service
The Distillers
Eisley
The Like
The Veronicas
Elefant
Shout Out Louds
World Leader Pretend
Lucy Woodward
Scissorfight
Waltham
Far-Less
Chris Brown
Shiny Toy Guns
Rock Kills Kid
Matt Costa
Thrice
Dirty Pretty Things
Lady Sovereign
Cassie
The Feeling
Kittie
Tantric

References

MTV News