There's way better music in Williams' Superman soundtrack than the main theme. If Jaws, Star Wars, Close Encounters, Superman, and Raiders are regarded as a pentalogy, then, despite the profound excellence of this music as a whole, I've always thought that the main theme to Superman is among the weakest pieces of the entire set. The "Love Theme from Superman" is powerful and timeless, and there are several other exceptional "movements" of the soundtrack that easily surpass the main theme; examples include "Leaving Home," "The Planet Krypton," and "The Fortress of Solitude". If I never heard the main theme in a Superman movie to come, I would not miss it.
Just as a "by the way," if Holst influenced Williams, then Copland certainly did, as well.
Just as a "by the way," if Holst influenced Williams, then Copland certainly did, as well.