The Portland Symphony Orchestra’s season finale will feature the Kotzschmar Centennial Celebration, with performances at 2:30 p.m. today and 7:30 p.m. Tuesday at Merrill Auditorium. Robert Moody conducts, and Ray Cornils will be featured on the Kotzchmar Organ.

The program includes Richard Danielpour’s “Toward the Splendid City,” Joseph Jongen’s Symphonie Concertante for Organ and Orchestra, and Camille Saint-Saens Symphony No. 3 in C minor, “Organ.”

A Concert Conversation will be an hour and 15 minutes prior to each concert, with a post-concert Q&A following both performances.

Tickets range from $20 to $70 and are available through PortTIX at 842-0800 or the box office at Merrill, 20 Myrtle St. 

• The Midcoast Symphony Orchestra, under the baton of music director Rohan Smith, will perform its final concert of the season at 7:30 p.m. Saturday at the Franco American Heritage Center in Lewiston and at 2:30 p.m. May 13 at the Orion Performing Arts Center at Mt. Ararat Middle School in Topsham.

John Ferrillo, principal oboe for the Boston Symphony Orchestra, returns to the midcoast to perform Mozart’s Oboe Concerto in C Major. The orchestra will also perform Igor Stravinsky’s ballet “Petrushka” and Leonard Bernstein’s “Candide” overture.

Ferrillo played with the orchestra in 2008. Prior to his tenure with the Boston Symphony, he played with the Metropolitan Opera as well as the San Francisco Symphony.

Tickets cost $17, and admission is free to anyone 18 or younger. Call 846-5378 or visit Tickets also are available at the door, at Now You’re Cooking in Bath, Gulf of Maine bookstore in Brunswick, and the Franco American Heritage Center, Lewiston.