Possible Clues:

• R&B singer with the 2004 #1 hit 'Goodies'
• "1, 2 Step" artist
• Mononymous R&B singer with the triple-platinum album 'Goodies'
• One-named singer with the #1 hit 'Goodies'
• ''Oh'' R&B artist
• Four-Grammy winner of 2006
• R&B artist with the 2005 hits "Oh" and "And I"
• R&B singer with 'Like a Surgeon' (no relation to the Weird Al song)
• Singer with the 2004 breakout album "Goodies"
• One-named singer with the 2005 hit 'Oh'