The College of the Siskiyous Vocal Jazz Ensemble under the direction of Roger Emerson will perform their Spring Concert on Saturday, May 2, at 7 p.m. in the Kenneth Ford Theater, and again on Sunday at 3 p.m. Admission is $8 for adults and $5 for students and seniors.  The group will perform selections from Earth, Wind and Fire, and the musicals “Hairspray” and “Spring Awakening,” in addition to a host of jazz standards. The group will also present the world premiere of Kirby Shaw’s “Lemon Twist,” written and dedicated to the jazz choir.