This entry was published at least two years ago (originally posted on May 27, 2018). Since that time the information may have become outdated or my beliefs may have changed (in general, assume a more open and liberal current viewpoint). A fuller disclaimer is available.
“The Deep Note, the distinctive synthesized crescendo that is THX’s audio trademark, is one of the most iconic sounds in all of film. For the effects firm’s 35th anniversary, they’ve now shared the sheet music behind the sound.”