Following is the program for the pop concert in Symphony Hall this evening: 1.March, "Pomp and Circumstance," Organ, Mr. Marshall.  Elgar 2.  Waltz, "Girls of Baden,"  Komzak 3.  Overture, "William Tell,"  Rossini 4.  Selection, "Oh! Oh! Delphine,"  Caryll 5.  Overture, "Rienxi,"  Wagner 6.  Meditation from "Thais," Violin Solo, Mr. Theodorowicz.  Massenet 7.  Selection, "La Boheme,"  Puccini 8.  "L'Arlesienne" Suite, No. 2,  Bizet   (a) Menuet. (Solo Flute, Mr. Chevrot).   (b) Farandot. 9.  Overture, "1812,"  Tschalkowsky 10.  Ave Maria,  Gounod 11.  Waltz, "Barcarolle,"  Waldteufel 12.  March, "En Avant,"  Gung'l