Bob Sarl has spent 20 years putting together a 60-minute documentary about in the life of guitarist Mike Bloomfield. In ‘Sweet Blues,’ Bloomfield attests to his obsessions in a long-ago tape recording that plays throughout the film, while his life story, milestone performances and commentary from associates paint a portrait of a tortured genius of rock. After playing with Paul Butterfield, Bob Dylan and Stephen Stills, among many others, Bloomfield’s hard-living, heroin-heavy lifestyle ultimately took his life in 1981. But his legend lives on in Carlos Santana, B.B. King and Charlie Musselwhite, all of whom recall Bloomfield’s influence in the film. Following this week’s screening is a tribute concert featuring Elvin Bishop, Harvey Mandel, Nick Gravenites, Maria Muldaur, Barry Goldberg and others on Friday, Oct. 11, at Sweetwater Music Hall. 19 Corte Madera Ave., Mill Valley. 7pm. $67. 415.388.3850.