Erin O'Leary, of Arlington Heights, performs with the BG Singers during the group's April 14 choral concert at Stevenson High School's Performing Arts Center. | Brian O'Mahoney~for Sun-Times Media

Dave Alhadeff, of Buffalo Grove, and Tom Korman, of Glenview, perform with the BG Singers April 14 for a choral concert at Stevenson High School's Performing Arts Center. | Brian O'Mahoney~for Sun-Times Media

Steve Schneider, of Buffalo Grove, performs with the BG Singers April 14 during the group's choral concert at Stevenson High School's Performing Arts Center. | Brian O'Mahoney~for Sun-Times Media

Lori Lapping, of Buffalo Grove, performs April 14 with the BG Singers during the group's choral concert at Stevenson High School's Performing Arts Center. | Brian O'Mahoney~for Sun-Times Media

Erin O'Leary, of Arlington Heights, performs with the BG Singers earlier this year during the group's choral concert at Stevenson High School's Performing Arts Center. | Brian O'Mahoney~for Sun-Times Media

Barbara Quinlan, of Deerfield, performs with the BG Singers during the groups choral concert April 14 at Stevenson High School's Performing Arts Center. | Brian O'Mahoney~for Sun-Times Media

Deborah Bloom (center) of Highland Park performs with he BG Singers during April 14's choral concert at Stevenson High School's Performing Arts Center. | Brian O'Mahoney~for Sun-Times Media

Deborah Bloom (center) performs with The BG Singers during the group's April 14 choral concert at Stevenson High School. The Singers will take the stage Saturday and Sunday for its 20th anniverary show. | Brian O'Mahoney~for Sun-Times Media