Editing Hidden track (section)

==Techniques==
A [[vinyl record]] may be [[Multisided record|double-grooved]], with the second groove containing the hidden tracks. Examples of double-grooving include [[Monty Python]]'s 'three-sided' ''[[The Monty Python Matching Tie and Handkerchief|Matching Tie and Handkerchief]]'', [[Tool (band)|Tool]]'s ''[[Opiate (album)|Opiate]]'' EP,<ref>{{cite web|url=http://toolshed.down.net/faq/faq.html|title=The Tool FAQ|access-date=2007-03-07|url-status=live|archive-url=https://web.archive.org/web/20070304132245/http://toolshed.down.net/faq/faq.html|archive-date=2007-03-04}}</ref> and [[Mr. Bungle]]'s ''[[Disco Volante (Mr. Bungle album)|Disco Volante]]''.

With the invention of digital media and [[compact disc]]s, alternative methods for hiding unlisted tracks were conceived. With a similar aim of concealment, unlisted [[Track (CD)|tracks]] are sometimes given their own separate index point on digital media. Songs can be placed in the [[pregap]] of the first track of certain CD formats, so that the CD must first be cued to the track, and then manually back-scanned. These are often referred to as Track 0<ref name="Katz">{{cite book|last=Katz|first=Bob|title=Mastering Audio: The Art and the Science|first2=Robert A.|last2=Katz|publisher=Focal Press|year=2002|isbn=0-240-80545-3|page=93}}</ref> or Hidden Track One Audio (HTOA).<ref>{{cite web|title=HTOA - Hidden Track One Audio|url=http://www.daefeatures.co.uk/htoa.php|url-status=dead|archive-url=https://web.archive.org/web/20090905083000/http://www.daefeatures.co.uk/htoa.php|archive-date=2009-09-05}}</ref> A [[CD player]] will not play these tracks without manual intervention, and some models (including many computer operating systems) are unable to read such content. On [[Super Furry Animals]]' ''[[Guerrilla (album)|Guerrilla]]'', "The Citizens Band" is found in the pre-gap approximately five minutes before the beginning of track one. A glossary of terms used in the song's lyrics is printed on the interior of the cardboard outer sleeve of the CD. This essentially renders them inaccessible without taking the sleeve apart, hiding the glossary in a parallel way to the song itself.

A less concealed method is to place the song at the end of another track, typically the last track on the album, following a period of [[silence]]. For example, [[Nirvana (band)|Nirvana]]'s song "[[Endless, Nameless (song)|Endless, Nameless]]" was included as a hidden track in this way on their 1991 CD ''[[Nevermind]]'', after 10 minutes of complete silence within the track listed as the final song.<ref>{{cite book|last=Cross|first=Charles R.|title=Nevermind|first2=Jim|last2=Berkenstadt|publisher=Music Sales Group|year=2004|isbn=0-8256-7286-4|page=103}}</ref><ref>{{cite web|title=Endless, Nameless|url=http://www.livenirvana.com/songguide/body0ff0.html?songid=31|url-status=dead|archive-url=https://web.archive.org/web/20060720155708/http://livenirvana.com/songguide/body0ff0.html?songid=31|archive-date=2006-07-20|access-date=2007-03-08}}</ref> Although it was not the first hidden song to use this technique, it gained significant attention.<ref name="Thompson">{{cite book|last=Thompson|first=Dave|title=The Music Lover's Guide to Record Collecting|publisher=Backbeat Books|year=2002|isbn=0-87930-713-7|pages=50–51}}</ref> Similarly, short tracks of silence can be layered before the hidden track plays.<ref name="Katz" /> On [[Lazlo Bane]]'s debut album, ''[[11 Transistor]]'', the eleventh song is followed by 57 silent tracks, each four seconds in duration, with "Prada Wallet" (sometimes referred to as "The Birthday Song") being the 69th track on the album. The total length of silence between the two songs is 3:48.<ref>{{cite web|title=11 Transistor - Lazlo Bane|url=http://www.allmusic.com/album/11-transistor-mw0000615852|url-status=live|archive-url=https://web.archive.org/web/20150926185341/http://www.allmusic.com/album/11-transistor-mw0000615852|archive-date=2015-09-26|website=AllMusic}}</ref>

It is possible for a track to be playable only through a computer, such as the '15th' track on [[Marilyn Manson]]'s ''[[Mechanical Animals]]'' album, which can only be accessed through an [[Enhanced CD]] executable.

There are yet-deeper ways a track can be hidden. A "ghost" track can be subtly mixed to play concurrently with other, dominant audio, or heavily distorted in a way which must be undone to be played. For example, on a [[DVD]] included with the deluxe and 'ultra-deluxe' editions of [[Nine Inch Nails]]' ''[[Ghosts I–IV]]'', two hidden bonus tracks ("37 Ghosts" and "38 Ghosts") are included as digital [[Multitrack recording|multitrack]] files, from which the songs may be reconstructed.