In many ways, it’s remarkable that the composer Bernard Herrmann, who died at age 64 in 1975, is as well known as he is. His scores to Alfred Hitchcock’s “Vertigo” (1958) and “Psycho” (1960) remain inseparable from those seminal pictures. Yet a significant number of Herrmann aficionados feel such recognition is insufficient, that much of this composer’s music is not just neglected but sorely underappreciated. And a good many of them gathered here recently, at Georgetown University and the National Gallery of Art, to make their case in a series of programs that examined not just Herrmann’s well-established achievements (like...