A perfect dozen: That’s the number of shows Sharing the Stage will have under its musical belt after Friday’s performance, which begins at 8 p.m. at the Red Bike.

Sharing the Stage, the collective brainchild of Rob Bordner, Harris Levinson and Fred Strong, began in 2009, as a series that brings Seattle bands to Vashon, while giving student and youth musicians the opportunity to open for the groups and experience performing in a professional venue.

This year, the headline band is the post-punk quartet Chastity Belt, which has recently garnered recognition around the country.

Student musicians audition for a spot in the show. Once accepted, they are mentored by a professional island musician. Past mentors have included Ian Moore, Van Crozier, Jacob Bain, Dominic Wolczko and Sarah Christine.

Camille Coldeen, a 2005 graduate of Vashon High School and professional musician who performs with Cherrywood Station, is the mentor this year and has high praise for the students.

“It’s been fun and very inspiring,” Coldeen said. “There is a lot of talent here.”

She added she appreciates that Vashon is offering more opportunities for budding musicians, citing Sharing the Stage and also Pete Welch and Allison Shirk, who invite students to open for some shows at the Red Bike.

“Vashon is such an arts-oriented community,” she said. “In adolescence, when you have so much creative energy, it is really a special thing to have such (an outlet) offered by the community.”

Eva Cyra wrote that she and her musical partner and friend Ruby Seago have shared many creative moments and often discover new music together — even Chastity Belt.

“This is the first time performing music together and hopefully not the last,” Cyra wrote. “We’re very excited to be opening the show and hope you enjoy our rendition of a beautiful French classic.”

Other acts will include Soccermoms, led by Camryn Kim-Murphy; Ten Cent Time Machine, a garage-rock band; indie-alt singer-songwriter Mallory Breen; and Payton Liesche and Kate Atwell, who call themselves a folky-pop-cover-indie-original duo.

As a singer-songwriter and performer, Coldeen said her mentorship role has been to help the students polish their stage presence and to “give them the kudos they deserve.” She encourages islanders to come to the show.

“What the community at large can do is to come out and support these guys, to really listen and fill the house as an engaged audience. That is huge for an artist, and it is a great way to contribute to the arts in our community,” she said.