Tenor Ben Heppener will not perform his much anticiapted October 22 with the National Symphony Orchestra due to a viral infection. Ben Heppner is recognized as one of the world's leading dramatic tenors, particularily excelling in the music of Wagner, Verdi and Berlioz . Mr. Heppener was slated to sing a program devoted to the music of Wagner conducted Edo de Waart. The concert will not be rescheduled for this season. To request a refund contact the Kennedy Center Advance Sales Box Office at (202) 416-8540.