Title: Undo (Rush of Fools song)
Content:  "Undo" is the first record single from contemporary Christian band Rush of Fools. It was released in 2007 from the band's first album Rush of Fools. It was the most played song of the year in 2007 on Christian adult contemporary radio. This song was also by the compilation album WOW Hits 2008.
Title: The Undoing (album)
Content:  The Undoing is the debut studio album by Steffany Gretzinger. Bethel Music released the album on August 25, 2014. Gretzinger worked with Jeff Schneeweis in the production of this album.
Title: Undo (Rush of Fools song)
Content:  The song received mixed reviews from music critics. Kim Jones, Christian music guide of About.com, called "Undo" an album "highlight" and praised its lyrical composition. In reference to the song's second verse, Jones said, "Honestly; how many teens do you know that are that real and introspective?". Jesus Freak Hideout's review was less positive towards the song, describing it as "kind of a 'paint by numbers' ballad that is commonly found on CHR [radio] stations." Christian Music Today editor Russ Breimeier was generally negative towards the band's first album, but said that the song possessed "a refreshing openness in its prayerful confession of sinful nature".
Title: Undo It
Content:  The song has received generally mixed reviews from music critics. Juli Thanki of Engine 145 gave the song a thumbs-down, calling it "a third-rate tune from Kelly Clarkson’s reject pile" and saying that it had "deeply stupid lyrics." Roughstock critic Matt Bjorke rated the song two-and-a-half stars out of five, saying that it had "catchy repeatable lyrics" but concluded his review by saying "she can do so much better." In his review for Allmusic, Stephen Thomas Erlewine called the song "strained sassiness." Billboard critic Deborah Evans Price was more positive in her review, comparing it to the "vengeful Carrie persona" of "Before He Cheats" and saying that it had "crisp, compelling" production. Kevin John Coyne of Country Universe gave the song an A- calling Undo It a short, sweet, and undeniably catchy song which features both “We Will Rock You” drum riffs and twangy fiddle, as if those two things together are as natural as peanut butter and chocolate.
Title: Undertale
Content:  The game's soundtrack was entirely composed by Fox with FL Studio. A self-taught musician, he composed most of the tracks with little iteration; the game's main theme, "Undertale", was the only song to undergo multiple iterations in development. The soundtrack was inspired by music from Super NES role-playing games, such as EarthBound, bullet hell series Touhou Project, as well as the webcomic Homestuck, for which Fox provided some of the music. Fox also stated that he tries to be inspired by all music he listens to, particularly those in video games. According to Fox, over 90% of the songs were composed specifically for the game. "Megalovania", the song used during the boss battle with Sans, had previously been used within Homestuck and in one of Fox's 
Title: Undertale Soundtrack
Content:  The game's soundtrack was entirely composed by Fox with FL Studio. A self-taught musician, he composed most of the tracks with little iteration; the game's main theme, "Undertale", was the only song to undergo multiple iterations in development. The soundtrack was inspired by music from Super NES role-playing games, such as EarthBound, bullet hell series Touhou Project, as well as the webcomic Homestuck, for which Fox provided some of the music. Fox also stated that he tries to be inspired by all music he listens to, particularly those in video games. According to Fox, over 90% of the songs were composed specifically for the game. "Megalovania", the song used during the 
Title: The Undoing (album)
Content:  musical world of Steffany Gretzinger." Logan Merrick, indicating in a 4.5 out of 5 review by Christian Music Review, states, "This whole album features song after song of authentic, pure, lyrical content." Signaling in a three and a half star review at 365 Days of Inspiring Media, Jonathan Andre writes, "The Undoing is great, and ought to be enjoyed thoroughly". Jessica Morris, awarding the album nine and a half stars for Jesus Wired, says, "Steffany Gretzinger's vocals are exquisite, and The Undoing allows them to shine brilliantly, largely due to the authentic and evocative worship created through the album."
Title: Undun
Content:  Undun is an existential concept album about the fictional character Redford Stevens, who is named after a Sufjan Stevens song. Its reverse-chronological narrative discusses his short, tragic life set in urban poverty. Expanding on the indie influence of the band's How I Got Over (2010), the album's music is characterized by snare-driven beats, neo soul elements, keyboard soundscapes, strings, choral arrangements, and tight dynamics.
Title: Undertale Soundtrack
Content:  battle with Sans, had previously been used within Homestuck and in one of Fox's EarthBound ROM hacks. For each section of the game, Fox composed the music prior to programming, as it helped "decide how the scene should go". He initially tried using a music tracker to compose the soundtrack, but found it difficult to use. He ultimately decided to play segments of the music separately, and connect them on a track. To celebrate the first anniversary of the game, Fox released five unused musical works on his blog in 2016. Four of the game's songs were released as official downloadable content for the Steam version of Taito's Groove Coaster.
Title: Undertale
Content:  ROM hacks. For each section of the game, Fox composed the music prior to programming, as it helped "decide how the scene should go". He initially tried using a music tracker to compose the soundtrack, but found it difficult to use. He ultimately decided to play segments of the music separately, and connect them on a track. To celebrate the first anniversary of the game, Fox released five unused musical works on his blog in 2016. Four of the game's songs were released as official downloadable content for the Steam version of Taito's Groove Coaster. Undertale soundtrack has been well received by critics as part of the success of the game, in particular for its use of various leitmotifs for the various characters used throughout various 

Question: Who was the composer of Undo?
Answer: Fredrik Kempe.