The orchestra’s program includes one of Britten’s most distinctive masterpieces, the Serenade for Tenor, Horn and Strings, which he wrote in 1943 for his partner, the tenor Peter Pears, and the great French-horn player Dennis Brain. Nicholas Phan, a distinguished young tenor who has released two memorable albums of Britten’s songs, is featured alongside the Knights horn player Michael P. Atkinson. Also on the program are concertos by Johann Sebastian Bach, his son C. P. E. Bach and Stravinsky, as well as the premiere of a Chaconne credited to the entire orchestra. (7:30 p.m., Naumburg Bandshell, midpark at 70th Street;