[[caption-width-right:344:The band during the One-X run]]
->''"So what if you can see the darkest side of me?\\
No one will ever change this animal I have become,\\
Help me believe it's not the real me,\\
Somebody help me tame this animal I have become,\\
Help me believe it's not the real me,\\
Somebody help me tame this animal,\\
This animal I have become!"''
-->"Animal I Have Become"

Three Days Grace is an [[AlternativeRock Alternative]] HardRock[=/=] PostGrunge group from [[CanadianMusic Norwood, Ontario, Canada]]. Formed in 1992 as the band Groundswell, they consisted of Adam Gontier (vocals, rhythm guitar), Neil Sanderson (drums, backing vocals), Brad Walst (Bass, occasional backing vocals), Phil Crowe (Guitar) and Joe Grant (Guitar), all attending high school at the time. This incarnation would ultimately break up 1995. They later reformed under the name Three Days Grace in 1997 as the trio of Gontier, Sanderson and Walst. In 2003 after their debut tour they enlisted Barry Stock as lead guitarist, allowing Gontier to simply sing in concert.

They released the demo for "I Hate Everything About You" in 2003, scoring them a record deal with Jive records. They released their [[SelfTitledAlbum self-titled]] debut album that same year.

On January 9, 2013, long-time singer Adam Gontier left, citing health issues. Brad Walst's brother Matt, then with My Darkest Days, filled in on vocals during their 2013 tour, and eventually was promoted to full-time vocalist on March 28, 2014, with "Painkiller" released as the band's first post-Gontier single not too long after. They now have "Human", their 2015 album out with mixed to positive reception, with the single "I Am Machine" being successful. They released their sixth album ''Outsider'' on March 9, 2018.

'''Current Members''':
* Neil Sanderson: Drums, keyboard/piano, Backing vocals
* Brad Walst: Bass, backing vocals
* Barry Stock: Guitar
* Matt Walst: Lead Vocals

'''Former Members''':
* Adam Gontier: Lead Vocals

* ''Three Days Grace'' - 2003
* ''One-X'' - 2006
* ''Life Starts Now'' - 2009
* ''Transit Of Venus'' - 2012
* ''Human'' - 2015
* ''Outsider'' - 2018

Gontier also preformed guest vocals in the Music/{{Apocalyptica}} song "I Don't Care" and in the Canadian supergroup Big Dirty Band for ''Series/TrailerParkBoys: TheMovie'' along with Alex Lifeson and Geddy Lee of Music/{{Rush}}, Die Mannequin's Care Failure, Ian Thornley of the band Thornley, and Music/TheTeaParty's Jeff Burrows.

!!'''Tropes associated with Three Days Grace:'''
* AlternativeMetal: They don't qualify as a whole, but their heaviest material takes influence from the genre.
* AbandonedWarehouse: The setting for the "Pain" music video.
* AllJustADream: The "Animal I Have Become" video. [[spoiler: Subverted in that his room's still a mess...]]
* AnimatedMusicVideo: "[[http://www.youtube.com/watch?v=QkSASi_eN_k Misery Loves My Company]]." Overlaps with DerangedAnimation.
* BandOfRelatives: Inverted; the band members have family members in ''other'' bands! Brad's younger brother Matt Walst is the lead singer of Toronto hard rock group My Darkest Days and Adam's cousin Cale Gontier plays bass for Vancouver alternative group Music/ArtOfDying (who got his start as one of TDG's guitar techs). Adam sang guest vocals on the re-recording of "''Inside It's Raining''" for AOD's major-label debut, and he'll usually make an appearance with the band to sing with them whenever they're both at the same festival. After Adam left, Matt was hired to fill in as the band's vocalist, eventually joining permanently.
* TheBandMinusTheFace: Adam left January 9, 2013.
* BreakupSong: Not actually as common as you'd think; Adam got married to his first wife after their SelfTitledAlbum was released and didn't divorce until 2013 by which time he had already left the group. Most of the songs from the debut have little to do with anger in the context of a relationship. Though it's still up-in-the-air what in the heck "World So Cold" and "Last To Know" are about.
** "Last To Know" is pretty clearly a BreakupSong about being left for another guy. "World So Cold" is debatable.
** One interpretation is Adam is singing "The High Road" about breaking up with the band.
* CallingTheOldManOut: "Just Like You"
* ChalkOutline: Used metaphorically in a song with the same name, the first single from ''Transit of Venus''.
* CoverVersion: Only "The Chain" by Music/FleetwoodMac has actually come from an album (which was ultimately cut from ''Life Starts Now'', becoming a bonus track). Live, they've been known to cover anything and everything, especially during the bridge of "Home," from Music/{{Filter}}'s "Hey Man, Nice Shot" to "Lose Yourself" by Music/{{Eminem}} ([[http://www.youtube.com/watch?v=FTtPuqOYUIs then there's this]]). Gontier alone likes to do spontaneous acoustic covers of old rock and alternative songs, such as "Wicked Game" by Chris Issak, "The Drugs Don't Work" by Music/TheVerve, "Rooster" by Music/AliceInChains, "Black" by Music/PearlJam, "Everything Falls Apart" by Dog's Eye View, "Another Lonely Day" by Ben Harper and "Free Fallin'" by Music/TomPetty.
** ''Transit of Venus'' features a cover of Music/MichaelJackson's ''Give In to Me''.
* DemBones: One of Adam's mic stands, shaped like a skeletal hand gripping the mic, which he sometimes fixes into the shape of [[WardingGestures the]] [[Music/RonnieJamesDio horns]] for fun.
* DontYouDarePityMe: "Misery Loves My Company":
--> ''I don't need your condescending''
--> ''words about me looking lonely.''
--> ''I don't need your arms to hold me''
--> '''cause misery is waiting on me!''
* EnemyWithin: One possible interpretation of ''Animal I Have Become''.
* GettingCrapPastTheRadar: In the "Break" music video, Barry flips off the camera ''and it goes uncensored''.
* JerkWithAHeartOfGold: In a very strange way, Adam serves as this in the video of "Animal I Have Become". His dark side becomes more prominent, and as a result he becomes more detatched and abrasive, but he still has good intentions and fears that his negative traits are outweighing his positive traits.
* LastNoteNightmare: Played with to the point of subversion in that while Gontier-era Three Days Grace were fond of this, it was usually during the chorus or other random parts of the song, not so much the last note itself. Adam Gontier just loves to sing in a soft voice and then scream at you five seconds later.
* LighterAndSofter: ''Life Starts Now'' compared to the first two albums. Some of the songs are easily the softest the band has ever done like "Lost In You", "Last To Know" and the self-titled track, and even most of the harder songs on it aren't quite as hard as most of their material from beforehand.
* MessyHair: The way Adam styled his hair around ''One-X''.
* MetalScream: Gontier gets one at the end of "Riot." Special mention goes to "Home".
** "The Abyss" has Matt doing one at the end.
* MohsScaleOfRockAndMetalHardness: Generally a 4 to 7, though a "Last to Know" may arguably go down to a 3.
* MrFanservice: Matt Walst is a very fit and handsome man who can dance very well (especially prominent during their live performances). Original singer Adam Gontier is also a ruggedly handsome man.
* NiceGuy: Adam is a tireless advocate for those overcoming drug addiction and/or depression, even today, despite no longer being in the band.
* [[NightmareFuel/MusicVideos Nightmare Fuel]]: The "Animal I Have Become" video.
* PerishingAltRockVoice: "Last To Know," bordering on Music/{{Coldplay}}-like murmuring.
* PrecisionFStrike: "Riot", "Wake Up", "Gone Forever" and "Overrated".
** ''Outsider'' is more profane than the aforementioned songs, containing songs like "Right Left Wrong", "Me Against You" (which has three instances of "fuck that"), and "The New Real".
* PoliceState: The "Just Like You" video.
* PunctuatedForEmphasis: The chorus of quite a few songs tends to employ this method as a means to convey their point. Very noticeable in songs such as "Break" and "I Hate Everything About You."
-->''Only when I stop to think about it...'' '''''I! HATE! EVERYTHING ABOUT YOU! WHY! DO I LOVE YOU?!'''''
* RageAgainstTheReflection: The "Animal I Have Become" video.
* TheRockumentary: "Live at the Palace" is a half-example; there's several extensive interviews and behind-the-scenes footage intermingled between the songs.
* TheReasonYouSuckSpeech: "Just Like You", "Overrated", and "Bitter Taste" all qualify as this.
* SillyLoveSongs: "Without You". But this is effectively balanced out by the more genuine-sounding "[[{{TearJerker}} Last to Know]]".
* SuddenlyShouting: Something Adam Gontier seemed to be ''very'' fond of while singing, to the point of it almost being a signature sound of his. Pick a song off any album during his time with the band and you'll most likely find him shouting during the chorus.
* SurprisinglyGentleSong: Lost In You, probably because it lacks a significantly sombre mood.
* VocalEvolution: Adams's voice on the debut was simply scratchy, grungy over-screaming without much technique. With the recent albums he's invited far more melody and flexibility than in his younger days, ranging from a higher register on some songs to a lower bass on others.
* WhatHaveIBecome: "Animal I Have Become"
* WorldHalfEmpty: "World so Cold"
* {{Yandere}}: Especially in the song "Over and Over"
** NightmareFuel when you consider that this song could ''actually'' be talking about Adam's addiction to prescription drugs.
* YouAreNotAlone: "Never Too Late".
** It's the point of the whole One-X album.