Question: Mr. Snowman was released by a country music artist who used to be one-half of what country duo?

Context paragraphs:
Some People Change (song): "Some People Change" is a song written by Julian Williams, Neil Thrasher, Jason Sellers, and Michael Dulaney.  It was originally recorded by American country music artist Kenny Chesney for his 2004 album "When the Sun Goes Down".  It was then recorded by Canadian country music artist George Canyon for his 2006 album "Somebody Wrote Love".  Finally, by American country music duo Montgomery Gentry recorded their version of the song and released it as a single.  It was released in August 2006 as the lead single from their 2006 album of the same name.  It peaked at number 7 on the U.S. "Billboard" Hot Country Songs chart and at number 57 on the U.S. "Billboard" Hot 100.

Setting the World on Fire: "Setting the World on Fire" is a song written by Ross Copperman, Matt Jenkins, and Josh Osborne and recorded by American country music artist Kenny Chesney, featuring American singer Pink.  It was released to country radio on July 28, 2016 and to digital retailers the following day as the second single from Chesney's seventeenth studio album, "Cosmic Hallelujah".  The song was also promoted to adult and pop radio on September 12, 2016.  The song was nominated for the Best Country Duo/Group Performance at the 2017 Grammy Awards.

Long After I'm Gone: "Long After I'm Gone" is a song co-written and recorded by American country music artist Big Kenny, one-half of the duo Big & Rich.  The song was released to country radio on August 18, 2009 as his debut single as a solo artist, where it debuted at number 57 on the U.S. "Billboard" Hot Country Songs chart that week.  It is the lead-off single to his second studio album, "The Quiet Times of a Rock and Roll Farm Boy", which was released on November 10, 2009, via Love Everybody/Bigger Picture.  Big Kenny wrote this with Marc Beeson and Richard Supa.

Stay a Little Longer (Brothers Osborne song): "Stay a Little Longer" is a song by American country music duo Brothers Osborne.  The song was released in March 2015 as the duo's third single overall.  Duo members John and T.J. Osborne co-wrote the song with Shane McAnally.  The song was nominated for the Grammy Award for Best Country Duo/Group Performance at the 58th Annual Grammy Awards.

Mr. Snowman: Mr. Snowman is a Christmas album by American country music artist John Michael Montgomery.  The album was released on October 7, 2003.  It was the first Christmas album of his career, and it includes both traditional Christmas music and newly recorded tracks.

Are You Gonna Kiss Me or Not: "Are You Gonna Kiss Me or Not" is a song written by Jim Collins and David Lee Murphy, and recorded by American country music duo Thompson Square.  It was released in July 2010 as the second single from their self-titled debut album, which was released on February 8, 2011.  The song has been certified 2× Platinum by the RIAA.  On November 30, the band received two nominations in 54th Grammy Awards for the song in Best Country Duo/Group Performance and Best Country Song but lost to "Barton Hollow" by The Civil Wars and "Mean" by Taylor Swift, respectively.

John Michael Montgomery: John Michael Montgomery (born January 20, 1965) is an American country music singer.  Montgomery began singing with his brother Eddie, who is one-half of the country duo Montgomery Gentry, before beginning his major-label solo career in 1992.  He has had more than 30 singles on the "Billboard" country charts, of which seven have reached number one: "I Love the Way You Love Me", "I Swear", "Be My Baby Tonight", "If You've Got Love", "I Can Love You Like That", "Sold (The Grundy County Auction Incident)", and "The Little Girl".  13 more have reached the top 10.  "I Swear" and "Sold (The Grundy County Auction Incident)" were named by "Billboard" as the top country songs of 1994 and 1995, respectively.  Montgomery's recordings of "I Swear" and "I Can Love You Like That" were both released concurrently with cover versions by the R&B group All-4-One.  Several of Montgomery's singles crossed over to the "Billboard" Hot 100, his highest peak there having been achieved by "Letters from Home" in 2004.  In 1994, he appeared on the PBS music program "Austin City Limits" during the season 19.

John Michael Montgomery discography: John Michael Montgomery is an American country music artist.  His discography comprises ten studio albums, a Christmas album, three compilation albums and thirty-six singles.  Of his albums, six studio albums and his 1997 "Greatest Hits" album are all certified gold or higher by the RIAA, with the highest-certified being 1994's "Kickin' It Up" and his 1995 self-titled album, both at 4×Multi-Platinum certification for shipping four million copies.  The former is also his highest-certified in Canada at 2× Platinum by the CRIA.  Montgomery's first seven albums were all issued via Atlantic Records Nashville, with "Pictures" in 2002 being his first release for Warner Bros.  Records after Atlantic closed its Nashville branch.  His Christmas album "Mr. Snowman" and 2004's "Letters from Home" were also issued by Warner Bros., and his most recent album (2008's "Time Flies") was released via Stringtown Records, his own label.

That Girl (album): That Girl is the debut solo album by American country music artist Jennifer Nettles, lead vocalist of the country duo Sugarland.  It was released on January 14, 2014, by Mercury Nashville.  The album features 10 songs written or co-written by Nettles and a cover of Bob Seger's "Like a Rock".  Nettles collaborated with songwriters Butch Walker, Richard Marx and Sara Bareilles, among others.  The album was produced by Rick Rubin at his Shangri-La Studios in Malibu, California.

Amy Allison: Amy Allison is an American country music artist and the daughter of jazz-blues musician Mose Allison.  She first became interested in country music as a kid growing up on Long Island, and first began making music as the lead singer of "Amy Allison and the Maudlins".  She then joined Ryan Hedgecock to form the country duo Parlor James in 1994, before embarking on a solo career in 1996.

Supporting paragraphs: Mr. Snowman John Michael Montgomery
Answer: Montgomery Gentry