This episode's headline: Reagan's Strategy: Edward Rollins; Who's For a Better Defense?; Landslide: Tories Triumph; ""Strike Up the Band"": Lost Musical Found. The guests include In Washington: EDWARD ROLLINS, Reagan Campaign Chairman; RICHARD ALLEN, Former Reagan National Security Adviser; WALTER SLOCOMBE, Mondale Defense Adviser. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; JUDY WOODRUFF, Correspondent; Reports from NewsHour Correspondents: JOHN ARLEN (BBC), in Santiago, Chile; MICHAEL BURKE (BBC), in Sharpeville, South Africa; CHARLES WALMSLEY (CBC), in Baie Comeau, Quebec, Canada