Infinity on High is the third studio album by alt-rockers Fall Out Boy, the follow-up to the band's commercially successful 2005 album From Under the Cork Tree. The album features collaborations with new producers and guest artists such as Babyface and Jay-Z, and sees the band experimenting with musical genres other than pop punk including R&B, soul, and flamenco. The group also utilized instruments such as horns, violins and pianos, which had not been used on previous releases. Infinity on High debuted at #1 on the U.S. Billboard 200, selling 260,000 copies in it's first week, making it Fall Out Boy's first #1 album and second Top Ten effort.