MUSIC Performances This Week DELICIOUS JAZZ. St. Philip's Plaza, located at Campbell and River roads. 743-3399. The Tucson Jazz Society presents a swinging evening at 8 p.m. Friday, July 12, as they help Café Terra Cotta celebrate its 10th anniversary. John Denman's Clarinet Marmalade provides the tunes and great food and drink will be available for purchase. Call the TJS hotline at 743-3399 for information. DESERT BALLADS. The Arizona Folkmusic and Folklore Preserve. 44 Ramsey Canyon Road. Hereford, AZ. (520) 378-6165. Arizona State Balladeer Dolan Ellis sings songs of the Southwest at 2 p.m. Saturday and Sunday, July 12 and 13. Suggested donation is $6. Seating is very limited. Call (520) 378-6165 for reservations and information. SONGS FROM DOWN UNDER. Our Mother of Sorrows Church. 1800 S. Kolb Road. 296-6277. The Australian Voices choral ensemble perform at 7:30 p.m. Saturday, July 13. These young adults sing about their country to the music of Australia's composers. Admission is by donation. Call 296-6277 for information. Announcements UNEARTH YOUR MUSIC. Southwest Center For Music. 2175 N. Sixth Ave. 884-1220. Test out your new material at the Tucson Songwriters Underground's next meeting at 6:30 p.m. Thursday, July 11. It's a nurturing atmosphere for both new and experienced writers. Call Bruce at 325-6299 for information. TEACH A TUNE. Big Brothers and Big Sisters of Tucson seeks volunteer music instructors to lead guitar and piano classes. Call Jennifer at 624-2447 for information.

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