Bittersweet is the first studio album by Life On Planet 9, the pseudonym used by American hard rock band Lo-Pro when releasing music of a more experimental nature. The album was released on August 20, 2011. The album's origins trace back as far as 2007, when Lo-Pro participated in an acoustic tour with Staind frontman Aaron Lewis. Tracks started as acoustic rock material, but as they developed, they gained further ambient and electronic elements. The sound strayed so far from their original hard rock sound that they decided to release it under another name.

Lo-Pro formed after members Pete Murray and Neil Godfrey started making music together after the breakup of their prior band, Ultraspank. Under the Lo-Pro name, they started recording demo material, which attracted the attention of Staind frontman Aaron Lewis, who was able to get them signed to Geffen Records. However, after the release of their first album, Lo-Pro in 2003, and recording a short 3 track acoustic CD for exclusive release on Napster, they were dropped from the label in 2004. The band would stay together, but the band would be relatively quiet for a number of years.

In 2007, the band began to focus on a more acoustic-driven songs. Upon Aaron Lewis wrapping up touring in support Staind's Chapter V album, Lo-Pro joined him for a short acoustic tour. The band debuted a number of songs in acoustic form, including "Letting Go", "Hang On", "Today", and "All I Have". Additionally, the band started another Myspace page up under the name of "Lo-Pro Acoustic", and streamed several new acoustic studio tracks, including "Clean the Slate", the otherwise unreleased "This is Not Goodbye", and a cover of Filter's song "Consider This". In early 2008, Murray announced that the band had been working on recording a full-fledged acoustic album, and intended to release it in early 2008. However, at this point, the band had been out of the public eye for a number of years, and felt their comeback album should be closer to their original sound. As such, they decided to proceed with another electric album, delaying the release of the acoustic album. Unfortunately, the band would be unhappy with the end product of the electric album, feeling it sounded more like a polished demo, prompting them to have further recording sessions through 2008 and 2009 with Angus Cooke, pushing the acoustic album even farther out.

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