'''Sigh''' is an [[AvantGardeMetal Avant-Garde]] BlackMetal band from Japan, maybe the first BlackMetal band ever from that country, which formed in Tokyo in 1990 and has the distinction of being one of the outright ''weirdest'' bands from an already weird genre. They were somewhat well-known among the black metal scene in the early 1990s for being signed to Deathlike Silence Productions, the record label of {{Mayhem}} guitarist Euronymous. Beginning as a fairly straightforward BlackMetal band, they increasingly began to [[NeoclassicalPunkZydecoRockabilly experiment with their sound a bit]], invoking MindScrew in the liner notes to ''Hail Horror Hail''. This culminated in 2001's ''Imaginary Sonicscape'', which goes to levels of GenreRoulette that quite possibly have to be heard to be believed and is commonly regarded as the band's MagnumOpus. After committing GenreAdultery with the PowerMetal and [[NewWaveOfBritishHeavyMetal NWOBHM]]-influenced ''Gallows Gallery'' (their biggest departure from BlackMetal and their only release not to feature any HarshVocals), they settled on a hybrid of BlackMetal, ThrashMetal, and SymphonicMetal for ''Hangman's Hymn'' and ''Scenes from Hell''. ''In Somniphobia'' and ''Graveward'' go back to the GenreRoulette of previous works. As of 2014, they describe their style as "Cinematic Horror Metal".

The band appeared in the music documentary ''Global Metal'', where they were particularly known for the line [[MemeticMutation "metal is something cool"]], their particularly vague reaction (and for some, a TakeThat) to the VisualKei scene that currently dominates Japanese metal. While they are not a VisualKei band or associated with it, they occasionally use visuals akin to most avowed VK artists, possibly as part of their GenreBusting appeal.

!!!Current line-up :
* Mirai Kawashima - vocals, keyboard, samples, formerly bass
* Shinichi Ishikawa - guitar
* Satoshi Fujinami - bass, formerly drums & guitar
* Junichi Harashima - drums
* Mika "Dr. Mikannibal" Kawashima - alto sax, vocals

Their major releases follow ThemeNaming, with the first letter of each one being a letter of the word "Sigh".
* ''Scorn Defeat'' (1993)
* ''Infidel Art'' (1995)
* ''Ghastly Funeral Theatre'' (1997; actually an EP rather than full-length but still follows the naming convention)
* ''Hail Horror Hail'' (1997)
* ''Scenario IV: Dread Dreams'' (1999; their fifth major release but fourth full-length, hence the "IV")
* ''Imaginary Sonicscape'' (2001)
* ''Gallows Gallery'' (2005; the least BlackMetal-sounding of all their albums, a fact which got them dropped from their then-label)
* ''Hangman's Hymn'' (2007)
* ''Scenes from Hell'' (2010)
* ''In Somniphobia'' (2012)
* ''Graveward'' (2015)

!!Associated tropes:

* AlliterativeTitle: '' '''H'''ail '''H'''orror '''H'''ail'', '' '''G'''allows '''G'''allery'', '' '''H'''angman's '''H'''ymn''.
* AvantGardeMetal: ''Definitely'', and possibly one of the ''weirdest examples of the genre''. You're not going to confuse a Sigh album for much else.
* BilingualBonus: All the song titles on ''Ghastly Funeral Theatre'' are in Japanese. Many of them refer to elements of Japanese mythology and folklore.
* BlackMetal: Japan's most famous export in the genre. Not all their albums fall under the genre, but most of them have elements of it, although they're very much a GenreBusting band starting with ''Infidel Art''.
* BrainsAndBondage: Dr. Mikannibal, who really is a doctor of physics.
* ConceptAlbum: ''Hangman's Hymn'' for sure, quite possibly ''Scenes from Hell'' and ''In Somniphobia'' (which includes a seven-part "Lucid Nightmares" suite) also.
* TheCoverChangesTheGender: Their cover of [[TeacherStudentRomance "Teacher's Pet" by Venom]] is sung by [[BiTheWay Dr. Mikannibal]].
* CoverVersion: Sigh have covered Music/{{Venom}} (quite a lot of Venom too, someone in the band must really like them), Necrophagia (not surprising as Mirai was a member of that band for at least one album), Music/JohnColtrane, and [[{{Music/Death}} Death]].
* DepravedBisexual: Mikannibal, who is bisexual, seems to cultivate this image on purpose. She has revealed in interviews that she has eaten cockroaches, drinks cow's blood before recording vocals, [[FetishFuel records vocals naked]], and enjoys [[GroinAttack urethra torture]] (inflicting it, that is).
* EpicRocking: Most releases have at least one or two really long songs. ''Infidel Art'' has five of them - only one song on that album ("Suicidogenic", at a mere 4:46) is less than eight minutes long. Their longest song, "Slaughtergarden Suite", is nearly eleven minutes long.
* GodIsEvil: "The Summer Funeral" includes the line "God is so evil if it was his will".
* HarshVocals: On every album except ''Gallows Gallery''. Interestingly, Mikannibal's harsh vocals are usually lower-pitched than Mirai's on ''Scenes from Hell''; on ''In Somniphobia'', she employs a larger variety of vocal styles and can be either higher- or lower-pitched than Mirai, depending on which style she is utilising.
* LimitedSpecialCollectorsUltimateEdition: Several albums have been reissued with bonus material in varying formats. The most extravagant have typically been 3LP or 4LP reissues by Dark Symphonies. Several albums have also gotten 2CD reissues.
* LoudnessWar: [[http://dr.loudness-war.info/album/list?artist=Sigh&album= Most of their recent albums to some extent]], but the two worst offenders: ''Hangman's Hymn'', at [=DR5=], and ''Scenes from Hell'', at [=DR4=]. Most of their [=CDs=] going back to ''Imaginary Sonicscape'' are pretty blatant victims, including remasters of their older material (the 2009 remaster of ''Scorn Defeat'', for example, is [=DR5=] compared to the original's [=DR12=], though the 2011 remaster is nicer at [=DR9=] on the first disc and [=DR8=] on the second); the original CD of ''Gallows Gallery'', at [=DR9=], is an exception, as is Blood Music's remaster, which is the first version of the album to get the sound right (The End's 2007 remaster, on the other hand, is a typical brickwalled mess at [=DR6=]). Additionally, while the albums going back to ''Infidel Art'' aren't as badly affected by this trope as a lot of recent material, there is still some clipping, though ''Scenario IV: Dread Dreams'' and ''Ghastly Funeral Theatre'' at least were given a lot of room to breathe at [=DR10=]. On the positive side, it is worth noting that there is a [=2CD=] reissue of ''Scenes from Hell'' with an alternate mastering of the album that averts this trope, and several of the albums were given vinyl releases, which often have different masterings. As for the [=CDs=], ''Graveward'' is the first Sigh album since ''Gallows Gallery'' not to be badly clipped (although it is still brickwalled, at [=DR6=]).
* MetalScream: Both Mirai and Mika use this as their primary vocal style to the point where their vocals are usually pretty much indistinguishable. An exception to this is ''Gallows Gallery'', which contains entirely sung rather than screamed vocals. However, SopranoAndGravel is not uncommon on their recent black metal albums either, as clean vocals are used in a number of their songs since ''Imaginary Sonicscape''[='=]s "Requiem - Nostalgia", especially on ''Hangman's Hymn''.
* MindScrew: '''Invoked.''' ''Hail Horror Hail'' says the following in the liner notes:
-->This album is way beyond the conceived notion of how metal, or music, should be. In Essence it is a movie without pictures; a celluloid phantasmagoria. Accordingly, the film jumps, and another scene, seemingly unconnected with the previous context, is suddenly inserted in between frames. Every sound on this album is deliberate, and if you find that some parts of this album are strange, it isn't because the music is in itself strange, but because your conscious self is ill-equipped to comprehend the sounds produced on this recording.
:: They have kept to this philosophy ever since.
* MoodWhiplash: They do this a lot. A prime example is on "Requiem - Nostalgia", which starts as a stately PowerBallad and ends with several hundred samples of what sound like giggling babies over a flippant classical snippet.
* NeoclassicalPunkZydecoRockabilly: Frequent on their albums, but nowhere near so much as on ''Imaginary Sonicscape'', which could also pretty much be described as musical GenreRoulette, what with oddities like disco and dub reggae breaks being thrown into the middle of almost every song. Not to mention the obligatory classical snippet overlaid with what appears to be several hundred samples of giggling babies that closes the album. ''In Somniphobia'' probably doesn't carry this trope out quite as much as ''Imaginary Sonicscape'', but it's probably close.
* NewSoundAlbum: Arguably, most entries in their discography count as this. ''Gallows Gallery'' is probably the biggest standout, with the songs being substantially shorter than those on their other albums and featuring substantial PowerMetal and [[NewWaveOfBritishHeavyMetal NWOBHM]] influence and no HarshVocals, although it could also be considered GenreAdultery since they never did anything else like it.
* OminousLatinChanting: ''Hangman's Hymn'' is full of it, which is to be expected considering that the album is structured as a funeral mass of sorts.
* ProgressiveMetal: Many of their albums have elements of it. ''Infidel Art'' may be the best example, with an average song length of about eight minutes. ''Imaginary Sonicscape'' and ''In Somniphobia'', with their various multi-part suites, are also good examples.
* RecurringRiff: ''Hangman's Hymn'' has many recurring melodic lines, riffs, and lyrics, culminating in the title track, which includes a section that's basically a CallBack to all the preceding songs.
* SopranoAndGravel: Most of their vocals are the typical MetalScream of black metal, but they use clean vocals on several albums as well. ("Requiem - Nostalgia" is a good example of this, as is nearly all of ''Hangman's Hymn''. ''Gallows Gallery'' is ''not'' an example as there aren't any HarshVocals on that album, except for bonus tracks).
* SpokenWordInMusic: Shows up occasionally, the most prominent examples being a couple of songs on ''Scenes from Hell'' feature narration by David Tibet of Music/{{Current 93}}.
* TheSomethingSong: "The Tranquilizer Song".
* UncommonTime: They use this pretty frequently. For example, 7/4 segments (or multiples thereof) show up in "Izuna", "Intro: Soushiki", "Outro: Higeki", "Hail Horror Hail", "42 49", "A Sunset Song", and "In Devil's Arms" (this list is undoubtedly not complete). They're still using compound meters in new songs as of ''Graveward'' (in "Kaedit Nos Pestis", for example).
* VocalTagTeam: On recent releases Mirai and Dr. Mikannibal trade off on vocals. Their vocals are almost indistinguishable from each other most of the time.
* WatchItStoned: Recommended by Mirai himself for ''In Somniphobia'': “Be sure to smoke first, then listen to this with headphones. Bad trip guaranteed.”
* WidgetSeries: Oh ''gods'' yes. They're one of the very weirdest bands from Japan, which, considering it has produced bands like Music/DirEnGrey and Koenji Hyakkei, is saying ''a lot''.