UI voice professor Ollie Watts Davis will open the 1995-96 Second Sunday Concert series with a recital at 2 p.m. Sept. 10. Soprano Davis will perform music by Mozart, Franz Schubert and Claude Debussy, as well as a cantata by John Carter. The free concert at the Krannert Art Museum and Kinkead Pavilion will be performed as a tribute to composer William Grant Still in the centennial year of his birth. Pianist Kathy Kozak and clarinetist David Harris will accompany Davis. The concert will be broadcast live on the sponsoring station, WILL-FM (90.9), with hosts John Frayne and Roger Cooper. Other concerts on this year's Second Sunday schedule: * Oct. 8, UI Concert Choir. * Nov. 12, UI Graduate String Quartet. * Dec. 10, oboist Nancy Ambrose King. * Jan. 14, String Society. * Feb. 11, Quincy Early Music Ensemble. * April 14, UI Trombone Chorale. * May 5, Tone Road Ramblers.