Dr. Greger Larson, evolutionary biologist by day and Pearl Jam enthusiast by night, provides a statistical analysis of Pearl Jam’s sets, including concert favorite “Corduroy” with a tease of Pink Floyd’s “Interstellar Overdrive.” American Masters Pearl Jam Twenty premieres nationwide Friday, October 21, 2011 at 9 p.m. on PBS (check local listings) as part of the first PBS Arts Fall Festival.