Mozart's "Cosi Fan Tutte" will have its final Utah Opera performance at 2 p.m. today in the Capitol Theater. Tickets, at $10-$35, will be available at the opera box office in the theater on a rush basis a half hour before curtain time.

Byron Dean Ryan conducts and Andrew Foldi has directed the popular comic opera, which features Brenda Harris, Ariel Bybee, Joseph Wolverton, William Parcher, George Hogan and Susan Deauvono. Members of the Utah Symphony are in the pit, costumes are by Susan Memmott Allred, lighting is by Kay Barrell, with wigs and makup by Diane Mikkelson.- THE UNIVERSITY OF UTAH music department will present its first-ever Mozart's Birthday Concert today at 3 p.m. in Kingsbury Hall.

Featured will be the U. Chamber Orchestra under Robert Debbaut, the Wind Symphony under James Jorgenson, the Marimba Quartet, Mount Olympus String Quartet, RPM2 Quartet, soprano Anne Riggio, tenor Todd Miller, pianists Juliet Gamero and Jamison Livsey and what is billed as "a special guest appearance" by Mozart.

Included on the program will be the "Ronda alla turca," "Eine kleine Nachtmusik," selections from the operas "Don Giovanni" and "The Magic Flute" and the "Alleluia" from the motet "Exsultate Jubilate."

Admission is by donation, with proceeds going to the music department scholarship fund.

- THE COMPOSERS GUILD will present its annual Composers Spectacular on Tuesday, Jan. 29, at 7:30 p.m. at Wasatch Presbyterian Church, 1620 S. 1700 East.

Featured will be pieces by winners in the guild's 1990 Composition Contest, including Lloyd Miller, who took first and second prizes in the jazz category; Brian Jackson Fetzer, second in popular; Sharleen Stevens, third in popular; Jeff Manookian, first in choral; University of Cincinnati composer Stephen Jones, winner of the $500 grand prize, and Cori Connors, Lesley Ann Treis, Jan Milligan and Ruth Gatrell.

Pieces will range from choral compositions to songs and piano solos, with additional entries to be heard via recordings at the guild's potluck dinner Feb. 24. The deadline for the 1991 contest is Aug. 31. For information call 451-2275.

- GERALYN GIOVANNETTI, new to the Brigham Young University music faculty, will present an oboe recital Tuesday, Jan. 29, at 7:30 p.m. in the Madsen Recital Hall of the Provo school's Harris Fine Arts Center. Joining her will be pianist Mack Wilberg, bassoonist Glen Williams and flutist Elaine Jorgensen in music of Poulenc and Vivaldi. Admission is free.

- THE UNIVERSITY OF UTAH A Cappella Choir, Ed Thompson director, will present its annual Showcase Concert on Wednesday, Jan. 30, at 7:30 p.m. in the Temple Square Assembly Hall. Choir members will perform both as soloists and as part of the group. Admission is free, but limited to those 8 and older.

- THE CONTEMPORARY MUSIC CONSORTIUM will present its first concert of the season Wednesday, Jan. 30, at 8 p.m. in Daynes Music Co.'s Steinway Hall, 156 S. Main.

Featured will be pieces by four composers, all of whom will be in attendance - the Fantasy for Violin and Piano of former University of Utah composer David Froom, now assistant professor of music at St. Mary's College in Maryland; "Singing to Sleep" for mezzo-soprano by Scott Wheeler, of Boston's Emerson College; University of Cincinnati composer Lloyd Ultan's "Introspections and Allegories" for clarinet and synthesizer; and the world premiere of the String Trio of Steve Roens, newly appointed assistant professor of music at the U.

Performers will include Utah Symphony principal clarinetist Christie Lundquist, violinist Lynette Thredgold, violist Jeffrey Wagner, cellist Audrey Terry and pianists Jed Moss and Marjorie Janove.

Tickets are $5 ($3 CMC members and students), available at the door, with a post-concert reception for CMC members at which the composers will be available to discuss their music.

For information call 581-6763.

- BASS CHARLES NELSON will sing a free recital on Thursday, Jan. 31, at 8 p.m. in the University of Utah's Gardner Hall. His program, titled "The Conspiracy Against the Operatic Bass," will include music of Offenbach, Verdi, Mozart and Mussorgsky, and his accompanist will be Jean Mainous.

Nelson is currently a member of the voice faculty at Abilene Christian University in Texas and has performed extensively throughout the United States in opera, oratorio and recital. His appearance is sponsored by the U. music department and the northern Utah chapter of the National Association of Teachers of Singing.

- CONDUCTOR NORMAN LEYDEN returns this week to lead the Utah Symphony in "A Salute to Glenn Miller and the Big Bands," Thursday, Jan. 31, in Weber State University's Browning Center for the Performing Arts in Ogden and Friday and Saturday, Feb. 1 and 2, in Symphony Hall. Starting time for each is 8 p.m.

A former arranger for both Miller's Army Air Force Band and the Tex Beneke-led Glenn Miller Orchestra, Leyden has for the past two decades served as associate conductor of the Oregon Symphony. In addition he serves as music director of the Seattle Symphony Pops.

Joining him and the orchestra for these concerts will be singers Sue Beacock and Jerry Lindsey for a lineup of '30s and '40s hits that will include "Moonlight Serenade," "Tuxedu Junction," "Little Brown Jug," "Chattanooga Choo-Choo" and such non-Miller standards as "I'll Never Smile Again" (Tommy Dorsey), "Frenesi" (Artie Shaw) and "Holiday for Strings" (David Rose).

Tickets to the Salt Lake performances range in price from $10 to $25 ($5 students), with Ogden tickets priced from $8 to $15. For information call 533-NOTE.

- PIANISTS DEL PARKINSON and Jeffrey Shumway will combine for an evening of duo-piano music Friday, Feb. 1, in the Temple Square Assembly Hall and again Saturday, Feb. 2, at Brigham Young University's Harris Fine Arts Center. They will be heard in the second of Rachmaninoff's two suites for two pianos, Ravel's "Rapsodie Espagnole" and Percy Grainger's arrangement of music from Gershwin's "Porgy and Bess."

Parkinson is professor of music at Boise State University. Shumway is director of piano studies at BYU. Starting time each night is 7:30 p.m. and admission is free.

- THE FINALS OF THE Utah Metropolitan Opera auditions will be held Saturday, Feb. 2, at 7:45 p.m. in the Temple Square Assembly Hall. Admission is free and the public is welcome.

Eight young singers will vie for first, second and third prizes and the chance to compete at regional auditions in Denver later this month. They are sopranos Linda Mugleston, Logan; Elizabeth Paniagua, Salt Lake City; Jill Hawkes, Salt Lake City, and Martha Gutierrez, Provo; mezzo-sopranos Ruth Christensen, Provo, and Marie-Adele Black, Orem; tenor James Miller, Salt Lake City, and baritone Eric Glissmeyer, Provo.

Judges will be soprano Irene Dalis, formerly of the Metropolitan Opera, associate Utah Symphony conductor Kirk Muspratt and local voice instructor Heidi McKay.