Lilas Mayassi, left, and Sherry Bechara, founders of the all-female Lebanese thrash metal band Slave to Sirens, as seen in the documentary 'Sirens' directed by Rita Baghdadi. Photo: Rita Baghdadi
Lilas Mayassi, left, and Sherry Bechara, founders of the all-female Lebanese thrash metal band Slave to Sirens, as seen in the documentary 'Sirens' directed by Rita Baghdadi. Photo: Rita Baghdadi

Lebanese female metal band subject of new documentary at Sundance Film Festival