At this point, Lil Herb is known for his mixtapes and guest appearances. He's also  just 19, and has yet to release a studio album. When that comes, and it surely will, we suspect the Chicago emcee will really blow up. With a lyrical assist from Odd Future member Earl Sweatshirt, who also produced the track, Herb's latest effort is the single 'Knucklehead.' In the cut, the pair reflect on all the bad decisions they made in their 'Knucklehead' youth -- which isn't so much in the rear view mirror when you are 19 and 20.

'Knucklehead' is an installment in Red Bull's new "20 Before 15" series, which will drop a total of 20 songs before the year turns to 2015.

What do you think of the song?