By Jeff Labrecque
July 06, 2011 at 08:03 PM EDT
Daniel Teixeira/Agencia Estado/

Daniel Teixeira/Agencia Estado/

Talihina Sky: The Story of the Kings of Leon, a documentary about the formation of the Grammy-winning band, will premiere on Showtime on Aug. 21 at 10 p.m. The film, directed by newcomer and friend of the band, Stephen C. Mitchell, uses old home videos and interviews to tell the story of three brothers and their cousin who rebelled against their religious Southern upbringing to form a rock band. The film had premiered in April at the Tribeca Film Festival. Watch the trailer below.

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Tribeca: Movies that Rock