Music Performances This Week BORDERS MUSIC. 4235 N. Oracle Road. Mary Baker and Jim Dixon preview their newest CD at 6 p.m. Sunday, August 22. Cosmic Debris performs at 7 p.m. Tuesday, August 24. Announcements DESERT BLUEGRASS JAM. The Desert Bluegrass Association holds three jam sessions this week. The first is at 6:30 p.m. Thursday, August 19, at Nimbus Brewery, 3850 E. 44th St.; the second is at 6:30 p.m. Monday, August 23, at Hidden Valley Inn, 4825 N. Sabino Canyon Road; and the third is at 6 p.m. Wednesday, August 28, at Schlotzky's Deli, 3025 E. Speedway Blvd. Play, sing along, or just listen. All are welcome. STRING PLAYERS WANTED. The Civic Orchestra of Tucson, a 60-piece volunteer symphony orchestra starting its 24th season, needs violin, viola, cello, and especially bass players. Come to a rehearsal and get acquainted at 7:30 p.m. Tuesdays at the Tucson Jewish Community Center. Call the director, Dr. Kreloff, at 325-3002 for information or to audition. TUNE CATCHERS. This women's a cappella chorus is seeking new members. Come to rehearsals at 7 p.m. on Mondays at the Fountain of Life Lutheran Church, 710 S. Kolb Road. Call 325-0655 for information.

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