Rex Allen Sr., 78, a singer and actor in Westerns who also served as the familiar voice in Walt Disney films and TV shows (as well as that of the father in Tomorrowland's "Carousel of Progress"), from injuries suffered when he was accidentally run over by a car, in Tucson, Ariz., Friday . . . Pulitzer Prize-winning historian C. Vann Woodward, 91, whose work shaped America's understanding of the South and its attitudes about race, Friday, in Hartford, Conn. . . . Grover Washington Jr., 56, the jazz saxophonist who was among the first young musicians to burst onto the jazz-funk scene, Friday in New York. Calling Washington "as versatile as any jazz musician in America," President Clinton said, "I will miss both the man and his music."