July is vocal month in Salt Lake City, with a slate of concerts scheduled in the Assembly Hall on Temple Square, and the Second International Summer Vocal Festival taking place at Promised Valley Playhouse July 11-23.

Following last year's successful school, many vocalists have signed on for study at this year's classes and seminars, but registration is still open, says Karen Trifiletti, education coordinator. Active participants pay a fee of $250, and each singer will work with the master staff of the school. Interested singers may contact Trifiletti at Promised Valley Playhouse, 364-5696.

Observers are also welcome, at a charge of $5 a day or $40 for the whole course. This includes all classes, lectures, public concerts and social events. Purchasers of the whole also receive a complimentary ticket for one of the gala concerts on July 22 or 23.

Myer Fredman, distinguished operatic conductor and head of the opera school at the State Conservatory of Music in Sydney, Australia will be artistic director of the school.

Staff members who will conduct lessons and lectures include Joan Dornemann, assistant conductor of the Metropolitan Opera in New York City, where she is coach to some of the world's top singers; Vera Rozsa, distinguished teacher of voice in London, whose pupils include Kiri Te Kanawa and similar luminaries; Raquel Adonaylo, prominent coach at the Curtis Institute in Philadelphia; and Miklos Szinetar, stage director of the Hungarian State Opera, Budapest.

Also on the staff are Elio Battaglia, professor of voice of the Turin Conservatory in Italy; Loh Siew-Tuan, Chinese/Malaysian soprano who teaches and coaches in London and Belgium; Emily Mair, soprano and professor of voice at the University of Wellington, coach and adjudicator; coach/accompanist Iain Burnside; Peter Lockwood, coach and accompanist on the staff of the Belgian National Opera; Ralph Nordell, language coach of English, German, Italian and Russian; and physiotherapist Jean Buswell.

Classes will be held from 10 a.m. to 1 p.m., and from 2 to 5 p.m. at Promised Valley Playhouse. An added feature this year will be "Lunch and Listen," a free series of mini-recitals from 1:15 to 1:45 p.m. in the Playhouse foyer, sung by workshop participants, on July 13-15 and 18-23.

The vocal school will culminate in three gala concerts, July 21, 22 and 23, all at 7:30 p.m. Thursday's free concert will be a song recital in the Assembly Hall on Temple Square. Friday's and Saturday's concerts will take the form of staged operatic scenes on the main stage at Promised Valley Playhouse. Fredman, Szinetar and Lockwood will be principal coaches for these concerts, to which admission will be $4.

The human voice will also be celebrated in a series of concerts beginning on July 8 in the Assembly Hall, where on July 8 the Oratorio Society of Utah, with Morris Lee conducting, will sing a program of religious, folk and patriotic works. Soprano Lila Stuart of the BYU voice faculty sings on July 9.

The Silkeborg Men's Choir of Denmark, celebrating its 60th anniversary with a North American tour, will perform July 10, with Ove Jensen as music director. Soprano Loh Siew-Tuan sings a program of art song on July 11, accompanied by Burnside; and Patricia Rozario, Bombay-born soprano now carving an international career in recital and opera, performs on July 12.

On July 13 and 14 artists from "down under" take over, with Diedre Elliott, mezzo soprano who won the 1987 Mobil/Radio New Zealand Song Quest, singing on Wednesday, and Paul Whelan, bass-baritone winner of the 1987 Australian Singing Competition, on Thursday. Both will be accompanied by Emily Mair.

Martina Bovet, soprano of the Basel (Switzerland) Opera, sings on July 15, and Lucio Gallo, Italian baritone, on July 16. Three soloists fill in the first of the following week, preceding the gala concerts: Miyuki Morimoto, a soprano making a career in London, on July 18; David Power, Utah baritone of concert and opera who heads the voice/opera program at the Unviersity of Utah, on July 19; and Diana Walker, coloratura soprano of New York City Opera who excels in the modern repertory, on July 20. All Assembly Hall concerts are free to those 8 years old and older.