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Vancouver Opera's bold presentation of Nico Muhly's Dark Sisters is enjoyable but less audacious than its subject matter might suggest

The plight of women trapped in plural marriage—one husband with multiple wives—glowed like a firebrand on the Perelman Theater stage on Sunday. Opera Company of Philadelphia’s Dark Sisters, in co-production with Gotham Chamber Opera and the Music-Theatre Group, is OCP’s final offering of the 2011-12 season.

The barely legal lives of women in polygamous marriages may seem like fertile ground for an opera. Dark Sisters, composed by Nico Muhly with a libretto by Stephen Karam, has many attractive moments in music and story, yet demonstrates the difficulties of drawing art from life.