There aren’t many examples of contemporary bluegrass bands crossing over into more widespread popularity. In fact, there might be only two: Allison Krauss and Union Station, and the Yonder Mountain String Band. But while AKUS tends to attract an older and more traditional crowd, Yonder Mountain has built a loyal following on college campuses, regularly plays mainstream venues, and was even on the bill at the 2008 Democratic National Convention, which took place in the band’s birth state of Colorado.

“I personally would like to believe it’s because of our songs,” guitarist Adam Aijala told DCist when asked about Yonder Mountain’s broad appeal. “People also know they can come to our show and have a killer time.”

The quartet, comprised of Aijala, bassist Ben Kaufmann, banjoist Dave Johnston, and Jeff Austin on mandolin, will perform at the 9:30 Club on Friday night, along with opener Danny Barnes. Yonder Mountain is touring in support of its latest recording, The Show, released last month, which showcases the band’s strong command of melody and songcraft. With producer Tom Rothrock (Foo Fighters, Elliott Smith, James Blunt), the group utilized all the tools of the studio, while maintaining the live feel of its previous albums, many of which were recorded in concert.