LaMontagne has released nine studio albums: Trouble, Till the Sun Turns Black, Gossip in the Grain, God Willin' & the Creek Don't Rise, Supernova, Ouroboros, Part of the Light, Monovision, and Long Way Home.

Critics have compared LaMontagne's music to that of Otis Redding, Ryan Adams, Beck, Pink Floyd, The Band, Van Morrison, Nick Drake and Tim Buckley.

[4] LaMontagne was inspired to quit his job and begin a career as a singer-songwriter after waking up one morning to the radio on his alarm clock playing the Stephen Stills' song "Treetop Flyer".

[6] In the summer of 1999 he recorded 10 songs for a demo album that was sent to various local music venues including Maine's Oddfellow Theater, where he was hired as an opening act for John Gorka and Jonathan Edwards.

[13] An EP of LaMontagne's performance at the Bonnaroo Music Festival was released in 2005 and his song "All the Wild Horses" was part of the soundtrack for the TV series Rescue Me[14] and the 2009 film The Boys Are Back.

[16] In 2005, he performed at two charity events, a New York City fundraiser for the victims of Hurricane Katrina and the Warren Haynes Christmas Jam.

His song "Be Here Now" was heard on the trailer for the movie Away From Her, in the film 27 Dresses, on the TV shows Bones, Covert Affairs, New Amsterdam, and Brothers & Sisters.

[citation needed] LaMontagne performed at KYSR's Lounge for Life charity concert on October 5, 2006, at the House of Blues in West Hollywood, California.

[26] The song, "Empty", appeared on an episode of Law & Order: Criminal Intent in 2010 and was heard during the film credits for the movie The Conspirator.

In 2011 LaMontagne sang a duet with Irish singer Lisa Hannigan, "O Sleep", which was featured on her Choice Music Award-nominated album Passenger.

[30] On October 9, 2014, LaMontagne spoke and performed at the Grammy Museum[31] Supernova garnered generally positive reception from music critics.

"[citation needed] Thom Jurek of AllMusic rated the album three and a half stars out of five, writing that "Supernova is unapologetically and indulgently retro; a casual listen might dismiss it as mere nostalgia"; however, the "pairing [of] Auerbach's detailed, careful production with LaMontagne's open, expertly crafted songwriting and breezy, sensual, emotionally unburdened singing, that boundary is shattered.

"[9] At The Guardian, Dave Simpson rated the album four stars out of five, remarking, "There's nothing here that's exactly new, but by assembling an array of unexpected influences in one blissful place, LaMontagne has crafted an unlikely perfect summer soundtrack.

"[citation needed] On July 23, 2014, during a show at the Meijer Gardens in Grand Rapids, Michigan, LaMontagne interrupted a song and walked off stage as a result of two fans talking during his concert, after having previously asked the audience to quiet down.

Club, Chris Mincher graded the album a B+, saying, "Supernova is a surprisingly bold, enterprising follow-up from an artist who could have easily ridden out the rest of his career on adult-alternative autopilot.

The first single released from the LP was "Such a Simple Thing', where those who purchased the album on LaMontagne's website received a stream of the live version of the track.

[43][failed verification][44] A Rolling Stone review of his album Supernova referred to his voice as an "impeccably weathered tenor croon" and his phrasing as "marble-mouthed.