Fans of NBC's The Voice, 2010's "Fuck You," or the mid-aughts creaton Gnarles Barkley may think that Cee Lo Green is just beginning to make his mark on the music industry. How wrong they would be. The Atlanta native, along with associated acts like OutKast, helped usher in a new sound and wave in the early- and mid-1990s as a member of Goodie Mob. But his work as an individual has always been revered, as well; his melodic, distinct vocals seem to melt perfectly into nearly any kind of track. WIth a collaboration with T.I., "Hello," dropping early this week, XXLMag.com thought it was the right time to look back at Cee Lo's 25 Most Memorable Guest Appearances (not including his work with Goodie Mob). Here they are. What's your favorite?