Question: Which documentary featured cameos by musicians, Go Further or The True Glory?
{'answer': 'Dave Matthews, Natalie Merchant, Ken Kesey, Bob Weir (of the Grateful Dead), Michael Franti (of Spearhead), Anthony Kiedis (of Red Hot Chili Peppers), Rob Heydon, Medeski Martin & Wood, and The String Cheese Incident', 'supporting_facts': [['Go Further', 4], ['The True Glory', 0]]}