Metamorphosis is the fifth album by California rock band Papa Roach. It was released by DGC/Interscope on March 24, 2009. The album was originally planned to be titled Days of War, Nights of Love, which is a lyrical quote from the song "No More Secrets" on the band's previous album, The Paramour Sessions. Subsequently, two songs on the album are titled "Days of War" and "Nights of Love". It is the first album to feature Tony Palermo on drums, who joined the band in 2007 after original drummer Dave Buckner's departure.

On May 17, 2008, Papa Roach performed two new songs at the Nashville, Tennessee Crawfish Boil, "Hanging On" and "Change or Die". "Hanging On" was later renamed to "Lifeline" after Jacoby Shaddix decided to change the chorus lyrics. A third song from the album was performed on July 1 in West Palm Beach, Florida at the Cruzan Amphitheatre, titled "I Almost Told You That I Loved You". It was then that vocalist Jacoby Shaddix announced the album's planned release date of August 26. However, Shaddix later mentioned the album's release date had been pushed to March 2009 on Pulse Radio, citing, "We want a new fresh year, a great start."

Mötley Crüe lead guitarist Mick Mars played the guitar solo on the track "Into the Light".

On October 26, 2008, the song "Hollywood Whore" was released as a music video through the band's official fan club website, before being formally released as an EP in Canada two days later. In other regions, the song became available as a digital single through iTunes.

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