Related Clues:

• Apply knuckles to wood
• Sharp smack
• Def Jam genre
• 50 Cent style
• Flo Rida's field
• Criticize, so to speak
• Form of music with chanted rhyming lyrics
• ''Pardon me . . .'' gesture
• Street music
• Eminem's art
• It's a faucet in the US
• Some dance back at the piano
• Spoken-word genre
• Kanye's forte
• Knock lightly