More than 1,100 students will participate in the annual Modesto City Schools Area Choral Concerts today through Thursday. The concerts are 7 p.m. in the Modesto High School auditorium. They are open to the public and free. The concerts are organized by junior high school attendance area. Today, elementary schools in the Mark Twain Junior High area will sing; Tuesday, the La Loma Junior High area; Wednesday, the Roosevelt Junior High area; and Thursday, the Hanshaw Middle School area. The elementary and junior high schools will perform several songs by themselves and then join together for two numbers at the end of the concert. The theme this year is "Disney Through The Years."