George I. Cannon will be the conductor for the seventh annual Parleys Stake "Messiah" Sing-In this evening at 7 at the Parleys Third and Fifth Ward meetinghouse, 2515 Stringham Ave.

Vocal soloists will be Naomi Jergensen, Marian Miller, Sue Thorup, Alison Stagg, Todd Miller and Vince Rampton. The audience is invited to bring scores, but they will also be available for loan shortly before the performance.Admission is free, and the public is invited.

- BALLET WEST concludes its annual "Nutcracker" run this week with performances at the Capitol Theatre. Evening performances will take place Monday through Wednesday, Dec. 28-30, at 7 p.m., with matinees scheduled Dec. 28-30 and Jan. 2 at 2 p.m., Dec. 31 and Jan. 3 at noon and 4:30 p.m.

The production features Willam Christensen's choreography, sets and costumes by Ariel Ballif and Terrence Kern or David Van Alstyne leading the Utah Chamber Orchestra in the Tchaikovsky score. Artists of the company alternate in multiple casting of principal roles.

Tickets priced from $10 to $35 are available at the Capitol Theatre or any ArtTix outlet; call 355-2787.

- SYMPHONY HALL becomes the site for a late-night party as the Utah Symphony presents its annual New Year's Eve concert on Thursday, Dec. 31, at 10 p.m. in Symphony Hall.

Under music director Joseph Silverstein, the orchestra will be heard in waltzes, polkas and marches by the Strauss family, along with Schubert's "Marche Militaire" No. 1 and the overtures to Offenbach's "La Belle Helene" and "Orpheus in the Underworld." In addition 13-year-old violinist Hilary Hahn, from Baltimore, will solo in Saint-Saens' "Havanaise" and Introduction and Rondo Capriccioso.

Then at midnight balloons will rain down, and noisemakers will sound as the audience joins in the traditional chorus of "Auld Lang Syne." The party will then move to the lobby and the Salt Palace north exhibition hall for a buffet supper and dancing to the sound of Potpourri and the DeSotos.

Tickets are $34, $38 and $42 ($25 students), available at the hall or all Smith'sTix outlets; for information call 533-NOTE.

- CARL L. ANDERSON, internationally recognized organist and choirmaster at the Cathedral of St. Mark, will present the cathedral's annual New Year's Eve all-Bach organ recital, beginning at 8 p.m. on Thursday, Dec. 31, at 231 E. 100 South. A voluntary donation will be taken.

Playing the cathedral's Holtkamp organ, Anderson will perform the Prelude and Fugue in B minor, BWV 544; Trio Sonata II, BWV 526; Partita Sei Gegrusset, BWV 768, and Prelude and Fugue in E Flat, BWV 552. Anderson participated in an international homage to Bach in summer 1985, which involved performances in Mexico, Italy and the United States. He has also performed in Argentina and toured Mexico in 1991.

- COMPOSER, PERFORMER AND ARRANGER Henry Mancini returns to appear with the Utah Symphony as soloist and conductor Saturday, Jan. 2, at Symphony Hall.

Featured on the 8 p.m. program will be a selection of the award-winning songs and television and movie themes that have made Mancini a household name over the years. Included will be music from "Hatari," "The Great Waldo Pepper," "Charade," "Peter Gunn," "Victor/Victoria" and the "Pink Panther" movies, along with music of Duke Ellington, Jerome Kern and a rock 'n' roll sing-along.

With four Oscars and 20 Grammys to his credit, Mancini has appeared with the London Symphony, Boston Pops, Royal Philharmonic and Israel Philharmonic orchestras. Tickets to his Utah Symphony concert are priced from $16 to $28, and are available at the hall or all Smith'sTix outlets; for information call 533-NOTE.