Following is the program for the Pop Concert in Symphony Hall this evening: Wagner Night. 1. Military March. Zach 2. Waltz, "Thousand and One Nights," Strauss 3. Overture, "Midsummer Night's Dream," Mendelssohn 4. Hungarian Rhapsody in F, Liszt 5. Prelude to "The Mastersingers of Nuremberg," Wagner 6. Preludes to Acts I and III, "Lohengrin," Wagner 7. Vorspiel and Liebestod from "Tristan and Isolde," Wagner 8. Ride of the Valkyries, Wagner 9. Three Dances from "Henry VIII," German 10. Spring Song, Mendelssohn 11. Selection, "The Merry Widow," Lehar 12. March, "El Capitan," Sousa