Concerts Prove Popular In Wartime WashingtonSunset Symphony Tonight Again to Find Many Servicemen in the AudiencePopular among the servicemen and the feminine war workers are the numerous out-of-door concerts where the best in music is presented almost every evening through the week and Sunday in sylvan settings. Scores of men in uniform attend these events at the Water Gate and in Meridian Hill Park and an equal number, or perhaps more of the young girls and women who have come here to do their part toward the winning of the war. sit and listen to the works of great masters presented by leading music organizations and artists.This evening will see another vast throng of music lovers sitting cn the steps of the Water Gate and on the lawn about the Lincoln Memorial to hear the National Symphony Orchestra in another of Its SunsetSymphonies.The Brazilian Ambassador and Senhora de Martins, who got back Saturday from a visit in their**South American home, will be among those of the Latin American diplomats at the concert tonight.They will hear a program conducted by their countryman. Mr.Burle Marx, founder and conductor of the Philharmonic Orchestra of Rio de Janiero. and the soloist will be Miss Elsie Houseton, Brazilian soprano. The program planned is of Pan-American music and the dean of the diplomatic corps, the Peruvian Ambassador. Senor Don Manuel de Freyre y Santander, as well as the Mexican Ambassador end his music loving family will be among others in the audience.The recently opened USO Club was the scene of a delightful party yesterday when Miss Martha Graham was the guest oJ honor at a 6 o’clock tea. Miss Graham, who gave a dance program earlier in the week at Meridian Hill Park will be the artist for another of the Starlight Concerts there tomorrow evening. Miss Elaine Scanlan was in charge of the arrangements for the tea and over 200 guests, principally from the Government agencies, attended.The USO Club is in the house at 1814 N street which at one time was the fashionable playhouse.Here groups of the socially prominent entertained at dances, teas and scores of benefits during the great war and for some years after.Mrs. Henry Porter Davidson, then Miss Betty Hanna, organized a group of players who presented a series of one-act plays for the benefit of one of the local charities.Among those who appeared with her in these plays were Mrs. Harold Stanley of New York, formerly Miss Louisa Todd, a debutante here some years ago: Mr. F. Marion Law, who formerly lived in Washington; the late Mr. Hugh A. Tennant, then connected with the British Embassy, and Col. Winant P. Johnston. U. S. A., who then was just back from duty in France with the AEF.The Junior League also used the playhouse for some of its benefits in those years and there a unique form of musicale was arranged by the late Mrs. Katie Wilson Greene who planned a series of lenten musicales in the late afternoon followed by tea. one given each week through the penitential season and the tea table always presided over by a prominent hostess of the Capital.