Musicians from the Florida Orchestra are giving a concert of chamber music to benefit the St. Petersburg Free Clinic. Members of the French horn section will play works of J.S. Bach (Sheep May Safely Graze), Paul Hindemith and others. The Arioso String Quartet will play Franz Joseph Haydn's Lark Quartet. Percussionists will play the music of Andrew Bealle (Rancho Jubilee) and Mark Ford. The free clinic, a 41-year-old nonprofit human services agency, has programs that provide food, shelter and health care to families and individuals facing emergency needs in Pinellas County. The concert is at 7:30 p.m. Tuesday at First Presbyterian Church, 701 Beach Drive NE, St. Petersburg. Admission is free, though a donation to the clinic is suggested.