hit number two on the Modern Rock Chart. In 2007, Walker provided guest vocals on Fall Out Boy's third record Infinity on High, on the track, "You're Crashing, but You're No Wave", and co-produced the track "Don't You Know Who I Think I Am?" with singer Patrick Stump. He also made a brief cameo in the video for "This Ain't A Scene, It's An Arms Race". In 2012, Walker produced Fall Out Boy’s fifth studio album Save Rock and Roll, which debuted at number one on the U.S. Billboard 200, earning the band’s second career number one. In 2007, Walker also helped write and produce Panic! At The Disco’s album, Vices & Virtues. Preceded by the lead single, "The Ballad of Mona Lisa", the album debuted at number seven on the Billboard 200 selling 56,000 copies within its first week. The album has sold 750,000 copies worldwide. Walker also appears in The Academy Is... videos for "Slow Down" and "We've Got a Big Mess on Our Hands" as well as the video for "So What" by Pink. He also co-wrote the songs "Breaking" and "Younglife", both of which are performed and co-written by Anberlin. Walker also joined the 9th annual Independent Music Awards judging panel to assist independent musicians' careers.[17] He was also a judge for the 8th annual Independent Music Awards.[18] In 2008 Walker signed on to judge a competition called Spin's Hot Pursuit to find an unsigned band for Epic Records/Original Signal hosted on Music Nation.[19] In January 2009, post-hardcore band Saosin tapped Walker to produce their second album for Capitol Records. In March 2009, the song "Open Happiness" debuted, a new business venture by Coca-Cola, written by Walker, and featuring Cee-Lo Green, Brendon Urie, Patrick Stump, Janelle Monáe and Travis McCoy. This song has a Cantonese cover version by Joey Yung on her new album, A Time For Us, and she is also filming advertisements for Coca-Cola in Chinese. In 2012, Walker produced the song "Everything Has Changed", written and recorded by Taylor Swift and Ed Sheeran for Swift's fourth studio album, Red. In 2021, Walker produced the re-recorded version of the song for Swift's second re-recorded album, Red (Taylor's Version). In 2022, Walker produced the song "August is Falling" by pop-punk band August is Falling, featuring on the EP The Simple Plan. The song received widespread commercial and critical acclaim and in the months following its