Metamorphosis is the sixth 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". This is their first album to feature Tony Palermo on drums, after the departure of Dave Buckner.
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 Amphitheater, 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."
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.
Initial critical response to Metamorphosis was average. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream critics, the album has received an average score of 46, based on five reviews. Chris Fallon of AbsolutePunk.net said about the album, "Big anthems, Jonas Brother album cover, lyrics that weave in & out of ambition-slash-unified hope and back-alley corners? Too many times the band takes one step forward and two steps back, at least showing some minimal signs of life in a dying genre built on repetition. Shaddix has a solid voice for this sound, and Horton seems to be discovering a new use for his distortion pedal, there are just far too many cliches in the ocean Papa Roach is trying to swim across, and the band can't seem to cope with their identity. Stephen Thomas Erlewine of Allmusic said that the album has "a dire determination to its purported good times": "While Papa Roach is a long long way from the depths of Hinder — that decade of work does give the band a professional snap, plus it never quite seems that Jacoby Shaddix's heart is into slagging that "Hollywood Whore" he berates on the album's first single — they miss the whole point of this kind of rock & roll launch: it should be more fun to listen to than it is to take out on the road."
The album landed at #8 in the Billboard 200, selling 44,000 copies in its first week. Despite its strong debut on the chart, Metamorphosis quickly slid out of the top 20 and charted at #25 its second week. However, in Canada things were different. The album charted #15 in its first week and charted at #1 in its second week. After one year of its release the album has sold over 400,000 copies in U.S. While much lower than their previous records, the album's sales are regarded as good to the modern standards of the music industry. As of 2010 the album has sold over 900,000 copies worldwide.[citation needed]