The Theory of Everything is the second studio album by Life On Planet 9, the pseudonym used by American hard rock band Lo-Pro when releasing music of a more experimental sound. The first album under the moniker, Bittersweet, had been more of an outlet for Lo-Pro's acoustic songs that had taken on too many electronic rock elements to be billed an acoustic album. The Theory of Everything largely disavows the acoustic elements in favor of electronic elements coupled with melodic guitar-work. It was released on August 26, 2014.

Lead singer Pete Murray and guitarist Neil Godfrey first began working with each other in the late 1990s for the nu metal band Ultraspank. After two albums, the band disbanded, though the two later started a new hard rock band in the early 2000s, called Lo-Pro. The band released their major record label debut, Lo-Pro in 2003, and despite a top 20 mainstream rock single, "Sunday", the band was dropped from their label. After the split, Murray and Godfrey spent an extended five-year period of working on new material before releasing anything. The band found themselves with some material that was more centralized around acoustic guitar and electronic effects than Lo-Pro's hard rock sound. As such, the band decided to release the Lo-Pro acoustic/electronic sessions under a different moniker; the pseudonym Life On Planet 9. The band finally released their debut album, Bittersweet, in August 2011.

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