Possible Clues:

• Performs a form of hip-hop
• Staples of séances
• Uses the knuckles
• Knocks with one's knuckles
• Sings like Snoop Lion
• Emulates JayZ
• Cracks showing in retro box
• Kanye West tunes
• 2006's 'Ms. New Booty' and others
• Jay-Z offerings