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In the field of recorded music, a hidden track (sometimes called a secret track or ghost track) is a piece of music that has been placed on a CD, audio cassette, LP record or other recorded medium in such a way as to avoid detection by the casual listener. In some cases, the piece of music may simply have been left off the track listing, while in other cases more elaborate methods are used. In some rare cases a "hidden track" is actually the result of an error that occurred during the mastering stage of the record's production. ==Techniques== A vinyl record may be double-grooved, with the second groove containing the hidden tracks. Examples of double-grooving are Monty Python's "three-sided" ''Matching Tie and Handkerchief'', Tool's ''Opiate'' EP〔(【引用サイトリンク】title=The Tool FAQ )〕 and Mr. Bungle's ''Disco Volante''. On indexed media such as compact discs, double-grooving cannot be used, but there are additional methods of hiding tracks, such as: * Similar to the above example, have the song as a separate unlisted track with its own index point. * Placing the song after another track (usually, but not necessarily, the last track on the album), following a long period of silence. For example, Nirvana's song "Endless, Nameless" was included as a hidden track in this way on their 1991 CD ''Nevermind'', after 10 minutes of complete silence.〔(【引用サイトリンク】title=Endless, Nameless )〕 Although it was not the first hidden track to use this technique, this hidden song gained significant attention. * Placing the song in the pregap of the first track, so that the CD must first be cued to the track, and then manually back-scanned; these are often referred to as Track 0 or Hidden Track One Audio (HTOA).〔("HTOA - Hidden Track One Audio" )〕 A CD player will not play these tracks without manual intervention, and some models (including computers) are unable to read such content. ''See List of albums with tracks hidden in the pregap.'' * * Placing the song in pregaps on other tracks on the album. * Using many short tracks of silence before the hidden track.〔 On Lazlo Bane's debut album ''11 Transistor'' the eleventh song "Miday Train" is followed by 57 silent tracks 4 seconds each with "Prada Wallet" (sometimes referred to as "The Birthday Song") being the 69th track on the album. The total length of silence between two songs is 3:48.〔(11 Transistor ) on Allmusic〕 Another example is Danzig's album, ''Danzig 4'', on which after the twelfth song, there are numerous blank tracks, until reaching the 66th track, the monotone chant, "Invocation", or Bowling for Soup's ''Drunk Enough to Dance'', Track 28, "Belgium".〔(【引用サイトリンク】title=Hidden Songs: Bowling for Soup, ''Belgium (Acoustic)'' )〕 * Making the track 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. * Hide the song in a mixed or distorted way which must be undone to play it. Often it is unclear whether a piece of music should be considered a hidden track. For example, "Her Majesty", which is preceded by fourteen seconds of silence, is unlisted on The Beatles' ''Abbey Road''.〔(【引用サイトリンク】title=Hidden Songs: The Beatles, ''Her Majesty'' )〕 This is one of the first instances of a hidden track. The song snippet at the end of ''Sgt. Pepper's Lonely Hearts Club Band'' is considered by some to be a hidden track, by others to be noise not worthy of such a designation, and by others to be part of "A Day in the Life".〔(【引用サイトリンク】title=Hidden Songs: The Beatles, ''Untitled'' )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hidden track」の詳細全文を読む スポンサード リンク
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