Folk music is hard to define. To some, it's any music passed down orally. To others, it's noncommercial music with an unknown composer. For many people, it's whatever Woodie Guthrie did. For Richard Rice, one of the producers of the San Francisco Free Folk Festival, it's "anything performed with a banjo in the room." No doubt there will be plenty of banjos in the room during the Free Folk Festival's two days of workshops and jamming. The workshops range from beginning fingerpicking for guitar players to the Indian dance styles of Bollywood. There are over 60 musical performers, including Dust Bowl Revival, The Littlest Birds and Anne and Pete Sibley, who won Best Americana Duo from public radio favorite A Prairie Home Companion. New for this year is a folk film festival, with the West Coast premiere of For the Love of the Music: The Club 47 Folk Revival, a documentary about the famed folk mecca Club 47. There's also a kids area with singing lessons and an open mic for the little ones. This festival is cool by any definition.