Following is the program for the pop Concert in Symphony Hall this evening: Tuesday May 6. 1.  March, "The Flag of Victory,"  Blon 2.  Overture, "The Barber of Seville,"  Rossini 3.  Waltz, "Roses from the South,"  Strauss 4.  Selection from "carmen,"  Bizet 5.  Overture, "The Bat,"  Strauss 6.  Introduction and Waltz,  Urack 7.  (a) Dance Duet,  Urack (b)Plotters' Trio,  Urack (c)Song of the Man-o'-war's men of the U. S. Fleet,  Urack 8.  Intermezzo, "The Jewels of the Madonna,"  Wolf-Ferrarl 9.  Overture, "Mignon,"  Thomas 10.  Largo,  Handel Violin, Mr. Hoffman; Organ, Mr. Marshall; Harp, Mr. Rodgers. 11.  Selection, "The Girl in the Train,"  Lehar 12.  March, "Kaiser Wilhelm,"  Nagel