Question: Who was replaced by Jon Walker in a band that Jake Sinclair had wrote songs for?

<P0-S0> Bulletproof Picasso is the seventh studio album by American rock band Train. <P0-S1>  The album was released by Columbia Records in Friday-release countries on September 12, 2014, and in the United States on September 16, 2014. <P0-S2>  It is available on CD, vinyl and as a digital download. <P0-S3>  It is the band's first album without drummer and founding member Scott Underwood, who departed from the band before it was recorded. <P0-S4>  It is also the band's first album since 2006's "For Me, It's You" to feature a full band line up. <P0-S5>  The producers were Azeem, Espionage, Greg Kurstin, Jake Sinclair, Butch Walker and Whams. <SEP> <P1-S0>  at the Disco is an American rock band from Las Vegas, Nevada, formed in 2004 and featuring the current lineup of vocalist Brendon Urie, accompanied on tour by bassist Dallon Weekes, guitarist Kenneth Harris and drummer Dan Pawlovich. <P1-S1>  Founded by childhood friends Ryan Ross, Spencer Smith, Brent Wilson and Urie, Panic! <P1-S2> Panic! <P1-S3>  at the Disco recorded its first demos while its members were in high school. <P1-S4>  Shortly after, the band recorded and released its debut studio album, "A Fever You Can't Sweat Out" (2005). <P1-S5>  Popularized by the second single, "I Write Sins Not Tragedies", the album was certified double platinum in the US. <P1-S6>  In 2006, founding bassist Brent Wilson was fired from the band during an extensive world tour and subsequently replaced by Jon Walker. <SEP> <P2-S0> Jake Sinclair (born March 7, 1985) is an American record producer, audio engineer, mixing engineer, multi-instrumentalist, vocalist, and songwriter. <P2-S1>  His production, engineering, songwriting, and mixing credits include Weezer, Fall Out Boy, Panic! <P2-S2>  at the Disco, 5 Seconds of Summer, Pink, New Politics, Andrew McMahon in the Wilderness, Gin Wigmore, and Train. <P2-S3>  at the Disco's "Death of a Bachelor" album (which debuted at number one on the US Billboard 200) and produced Weezer's 2016 "Weezer (White Album)". <P2-S4>  Both were nominated for Best Rock Album at the 59th Annual Grammy Awards. <P2-S5>  Sinclair co-wrote and produced Panic! <P2-S6>  He co-wrote and produced "Uma Thurman" by Fall Out Boy, which debuted at number one on the U.S. iTunes Chart, reached number 22 on the Billboard Hot 100, and was certified 2X Platinum by the RIAA in December 2015. <P2-S7>  Sinclair received a Grammy nomination for Album of the Year for his work as engineer and bassist on Taylor Swift's "Everything Has Changed" alongside producer Butch Walker. <P2-S8>  He co-wrote and produced the debut single, "She Looks So Perfect" by 5 Seconds of Summer that peaked at number one in over five countries and won "Song of the Year" at the 2014 ARIA Awards. <P2-S9>  Sinclair is the former bassist of the indie/pop rock band The Films and the lead singer and producer of the indie pop duo Alohaha. <SEP> <P3-S0> Nite Flights is the sixth and last studio album by the American pop group The Walker Brothers, released in July 1978. <P3-S1>  Each member of the group wrote songs for the album: two by Gary Walker with Scott Walker and John Walker each contributing four. " <P3-S2> The Electrician" was released as a single from the album.