Deep Note

**Deep Note** is a crescendo used for THX trailers.  It was created by James A. Moorer in 1983, who was now an employee of the Lucasfilm Computer Division.

Furthermore,

## Previous works
Prior to the creation of Deep Note, several other works made use of similar techniques of frequency spread.

In their book *Analog Days*, Trevor Pinch and Frank Trocco point to the track "Spaced", from the 1970 Beaver & Krause album *In a Wild Sanctuary* as the source for Deep Note. They quote synthesizer builder Tom Oberheim as saying the original analog form is much richer than the "digital perfection" used in movie theatres.

Other similar predecessors include:
* Iannis Xenakis' piece *Metastasis* 1955, which contains a very similar effect in the first minute that begins on a single tone and slowly spreads into a quarter tone cluster.
* The Beatles' 1967 song "A Day in the Life," which concludes with "an orchestral crescendo".
* Styx's 1974 song "Krakatoa," which features the spread tone.
* Yellow Magic Orchestra's 1981 track "Loom," with an upward slow glissando to crescendo at the beginning.

## In popular culture 
The perceived loudness of the Deep Note is frequently depicted as having actual destructive effects:
### In movies and TV shows
* The 1992 made-for-video feature *Tiny Toon Adventures: How I Spent My Vacation* shows a Deep Note–like trailer blasting a theatre, concluding with the text "THUD: The Audience Is Now Deaf."
* In the 1994 *Simpsons* episode "Burns' Heir," a THX trailer plays before a movie, blowing the audience back, shattering eyeglasses, teeth, and even causing one person's head to explode; despite this, Grampa Simpson shouts, "Turn it up! Turn it up!"  This segment was later turned into a THX theatrical trailer.
* In the 2006 movie *Over the Hedge*, Deep Note is featured in a scene late in the movie, when the animals enter a house and the porcupines were trying to setup a camera with a television, but accidentally tune the TV to a movie starting with the sound. The shear force of the sound blows some porcupine quills off.
* In the *Boondocks* episode "...Or Die Trying", Grandpa mimics the "Deep Note" when reassuring Jazmin that the theater they are going to is a quality theater.
* In the very beginning of the 2006 movie *Tenacious D and the Pick of Destiny*, Deep Note is parodied in the beginning by Jack Black and Kyle Gass with cartoon versions of themselves flying via flatulence propulsion, and the words "THC: The Audience is now baked" appear on the screen.

### In Video Games 
* Tex, and the THX trailer that shares his name, are featured in an easter egg on *Midnight Club: Los Angeles* Xbox 360 and PlayStation 3 releases and Taz: Wanted PlayStation 2, Xbox, GameCube and PC versions, the lower-pitched version of the "Deep Note" is heard.

### In music
* Rapper Dr. Dre was sued in 2000 by Lucasfilm, then-owner of THX, for using an unauthorized cover of "Deep Note" on his album *2001*. 
* Australian grindcore band The Berzerker use the sound in their concerts after they perform the song "Mono Grind."
* The "Mega Lo Mania Remix" of Mylène Farmer's song "California" begins with Deep Note.
* Rock band Asia used Deep Note as the opening for the song "Countdown to Zero" from their 1985 album Astra.

### Homage
* A sound similar to Deep Note is included as an easter egg in the BitTorrent client µTorrent.
* A sound similar to Deep Note is used in the logo for Tokuma Japan Communications, the home video division of Tokuma Shoten.
* Radio host Tom Leykis used Deep Note to "take out" callers, "THX style," until he received a cease and desist notice. 
* The LucasArts adventure game The Curse of Monkey Island opens with a large 'CMI' logo with a Deep Note, accompanied with the caption "The Monkeys are Listening"
* Tex, and the THX trailer that shares his name, are parodied in an easter egg on *The Simpsons Movie* DVD and Blu-ray releases. The trailer was made without the involvement of THX. In this parody, Tex awakes Homer Simpson, who was sleeping in a hammock. He is then chased around the frame, and was smashed before he can "repair" the trailer. Besides, the logo is not shown entirely. The logo reads "TH\" and a parody of the "Deep Note" is heard. This trailer is a parody and was not approved by THX.
* The sound was nominated for a Golden Raspberry Award for Worst Movie Trend.
* Tex, and the THX trailer that shares his name, are featured in an easter egg on *Duck Dodgers Starring Daffy Duck* Nintendo 64 release. The trailer was made without the involvement of THX. In this parody, Tex awakes Daffy Duck, who was sleeping in a hammock. He is then chased around the frame, and was smashed before he can "repair" the trailer. Besides, the logo is shown entirely and a lower-pitched version of the "Deep Note" is heard.

## References
## Other websites
* Deep Note  mp3 at USPTO
* THX trailers