PORTLAND — The Oratorio Chorale will make a guest appearance with the Vox Nova Chamber Choir at a Portland Symphony Orchestra concert on Sunday, May 1, and Tuesday, May 3.

Featured will be the full score of Ravel’s ballet “Daphnis et Chloe,” notable for its rhythmic diversity, lyricism and evocations of nature.

The PSO’s Robert Moody will conduct.

Concerts will be at 2:30 p.m. on Sunday and at 7:30 p.m. on Tuesday at Merrill Auditorium. For ticket information, visit www.portlandsymphony.com