The Roots have twenty years of output and that kind of longevity can be confusing for new listeners or just generally harder to put into perspective. FME gathered the best minds to talk about the defining eras and the redefined eras, from album to album. How the group shifted...what worked and what didn't. Zilla Rocca and Rob are in Philly. They speak on the group with expertise as well as the character of the city.  Things went very deep!