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Although filmmaker Stephen Kijak is known for his music documentaries including "Stones in Exile," "Backstreet Boys: Show 'Em What You're Made of" and "Jaco," a film about the late legendary jazz bassist Jaco Pastorius, he didn't know what he was getting into when he was introduced to the Japanese metal band X.

"I had never heard of them before I got called by my producer to do the film, to be perfectly honest," Kijak said during a telephone call from Los Angeles. "It was a whole world of discovery for me, and as someone who has done a lot of films about music and musicians, I was deeply embarrassed to discover a massive gap in my knowledge."

"We Are X"

The world documentary premieres Saturday, 2:30 p.m. at Prospector Square Theatre, Park City. Additional screenings will be held at the Tower Theatre in Salt Lake City on Sunday, Jan. 24, at 6 p.m.; the Redstone Cinema 2, Park City, on Tuesday, Jan. 26, at 10 p.m.; the Yarrow Hotel Theatre, Park City on Thursday, Jan. 28, at 9 a.m. and the Holiday Village Cinema 2, Park City, on Friday, Jan. 29, at 9:15 p.m. For more information, visit http://www.sundance.org.

In concert • Yoshiki, who is the subject of Stephen Kijak's Sundance documentary "We Are X," will perform an acoustic set Sunday at 4 p.m. at the ASCAP Music Café in Park City. The café is open to all Sundance Film Festival credential holders as space allows. For more information, visit http://www.ascap.com/sundance.