The Colby Symphony Orchestra and the Colby College Chorale will perform a combined concert on Sunday, Dec. 6, at 8 p.m. in Colby's Lorimer Chapel. The concert is the eighth event in the Music at Colby Concert Series and is open to the public free of charge.

The chorale and orchestra, under the direction of Paul Machlin, Colby's Arnold Bernhard professor of music, will perform music by J.S. Bach and Peter Ré. The orchestra, directed by Laura Jackson, will perform Felix Mendelssohn's Reformation symphony.

The program begins with Bach's Cantata No. 34, a festive work (adapted by Bach from an earlier wedding cantata) that includes two energetic movements for chorus as well as a beautiful solo aria for alto voice with obbligato flutes.

The audience then will be treated to the first-ever performance of A Christmas Triptych, a set of carols composed by Emeritus Professor of Music Peter Re. After intermission the evening will conclude with Mendelssohn's Symphony No. 5, "The Reformation."