The festivities kick off this year with the premiere of John Luther Adams's "Sila: The Breath of the World," a site-specific work inspired by Inuit traditions. (It will be performed on July 25 and 26 at 6 p.m. in the Hearst Plaza, 40 Lincoln Center Plaza; free.) The Mostly Mozart Festival Orchestra offers a free preview concert at Avery Fisher Hall on July 26 at 7:30 p.m., with music by Gluck and Mozart, as well as Berlioz's "Symphonie Fantastique." (Tickets are required, and will be available starting at 10 a.m. on July 26 at the Avery Fisher Hall box office.) On July 29 and 30 at 8 p.m., Louis Langr�e conducts the festival orchestra in an all-Mozart program, with Richard Goode playing the Piano Concerto No. 23. On July 31, Mr. Goode also performs in the first "Little Night Music" concert (at 10 p.m.); his program at the candle-lit Kaplan Penthouse will include selections from Bach's "Well-Tempered Clavier" Book II and Schubert's Sonata in B flat. The festival continues through Aug. 23; full schedule: mostlymozart.org.