Possible Clues:

• "Walk This Way" rap trio
• Pioneering hip-hop trio from Queens
• '80s hip-hop pioneers
• First rap group on MTV
• 'It's Like That' rappers
• "My Adidas" hip-hop trio (Last 2 letters + ...)
• Trio whose DJ was killed on October 30, 2002
• 2009 Rock and Roll Hall of Fame inductee
• 'Christmas In Hollis' group
• Pioneering rap trio