If you were wondering what the heck phrenology means, the Roots wouldn't have it any other way. Hip-hop's hardest-working live band continues where they left off with Things Fall Apart, forcing listeners to think outside of the Hot 97 FM box--or just plain think. On "Thought at Work," lead emcee Black Thought--the most criminally underrated wordsmith of his time--weaves captivating flows over a neck-snapping break beat, while on "Water" he boldly addresses the controversy surrounding his partner-in-rhyme Malik B's alleged substance abuse. While collaborations with Nelly Furtado ("Sacrifice") and Talib Kweli ("Rhymes and Ammo") read much better on paper than they sound, the catchy, up-tempo call-and-response routine utilized by the crew on the latter song will amp up Roots nonbelievers. As a bonus, Jill Scott's dreamy falsetto refrain hammers home some finer points about love on "Complexity." --Dalton Higgins