17-Year-Old LL Cool J Performing In Portland Maine For The First Time In 1985 (Video)3 Comments It’s not throwback Thursday yet but you can still watch this rare video of LL Cool J back when he was only 17-years-old performing in front of a all white crowd in Maine before his hit song ‘Radio’. The announcer and singer at the end is Cornell Clark, who LL has described as his mentor. LL was paid $500 for the show and only got booked cause they couldn’t afford Run DMC. Since he was the only rap act, he was worried it would a be short performance, so my dad suggested he fill it in with the scratching and beat boxing education. Kids that were there.