Bob Noel writes:

by being totally grabbed by the whole experience, not just the music.
The music is there to add/enhance/emphasize, not to scream "HEY
LISTEN TO THE MUSIC"

John Williams did a great deal to bring back this type of music to motion
pictures. He's very good at matching the music to the action, although, in
some cases, the action has been matched to the music (in the case of _Close
Encounters_ for some sequences, as I recall).

If you want a superlative example of music that you don't notice, watch just
about any Warner Bros. cartoon. Carl Stalling had an uncanny mastery of this
type of music (most of the sound effects in the cartoons are in fact musical).

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