Talent, songwriting ability, live shows: these are all factors that are generally considered when we think about musicians and their impact on the rock era. However, when you really get down to it, isn't hair the biggest factor? Coolio? Mediocre rapper, but managed to grab a few hits just because of the quality of his braids. Thankfully, for the benefit of barber shops everywhere, Pop Chart Lab has captured the most iconic hairstyles in recent music history on one affordable poster.