Scars are areas of fibrous tissue (fibrosis) that replace normal skin after injury. A scar results from the biological process of wound repair in the skin and other tissues of the body. Thus, scarring is a natural part of the healing process. With the exception of very minor lesions, every wound (e.g. after accident, disease, or surgery) results in some degree of scarring. An exception to this is animals with regeneration, which do not form scars and the tissue will grow back exactly as before.

Scar tissue is the same protein (collagen) as the tissue that it replaces, but the fiber composition of the protein is different; instead of a random basketweave formation of the collagen fibers found in normal tissue, in fibrosis the collagen cross-links and forms a pronounced alignment in a single direction. This collagen scar tissue alignment is usually of inferior functional quality to the normal collagen randomised alignment. For example, scars in the skin are less resistant to ultraviolet radiation, and sweat glands and hair follicles do not grow back within scar tissue. A myocardial infarction, commonly known as a heart attack, causes scar formation in the heart muscle, which leads to loss of muscular power and possibly heart failure. However, there are some tissues (e.g. bone) that can heal without any structural or functional deterioration.

Papa Roach is an American rock band from Vacaville, California. Their first major-label release was the triple-platinum album Infest (2000). The group's success continued with their gold album Lovehatetragedy (2002), their platinum album Getting Away with Murder (2004), The Paramour Sessions (2006), and Metamorphosis (2009). The band's seventh album, Time for Annihilation, was released on August 31, 2010. Papa Roach has sold about 10 million album copies worldwide, and are known for their hits "Last Resort", "Between Angels And Insects", "She Loves Me Not", "...To Be Loved", "Scars", "Forever", and "Hollywood Whore".

The formation of Papa Roach began in January 1993, when lead singer Jacoby Shaddix and drummer Dave Buckner met on the Vacaville High School football field during an intense match, where the two ended up talking about music. They were later joined by trombonist Ben Luther and bass guitarist Will James. They decided to enter the school's talent show, where they performed a cover version of Jimi Hendrix's song "Fire", but they ultimately did not win the contest. In March 1993, trombonist Ben Luther was replaced by lead guitarist Jerry Horton from nearby Vanden High School. Horton was introduced to the band through his girlfriend, who was a fan. However, Jerry was at first apprehensive about joining the band because Jacoby, Buckner, and Will all went to different high schools. At this point, Papa Roach were practicing every day and touring on every gig they could get. Their first tour van was called Moby Dick, where Jacoby was inspired to come up with his first stage name "Coby Dick". The band's name comes from Shaddix's step-grandfather, Howard William Roatch, who was nicknamed Papa Roach. Roatch committed suicide in 2006 because he was diagnosed with terminal cancer. The band pay homage to him with The Paramour Sessions and during live performances of the song "Roses On My Grave".

Wasalu Muhammad Jaco (born February 16, 1982), better known by his stage name Lupe Fiasco ( /ˈluːpeɪ/ LOO-pay), is an American rapper, record producer, and entrepreneur. He rose to fame in 2006 following the success of his debut album, Lupe Fiasco's Food & Liquor. He also performs as the frontman of rock band Japanese Cartoon under his real name. As an entrepreneur, Fiasco is the chief executive officer of 1st and 15th Entertainment.

Raised in Chicago, Fiasco developed an interest in hip hop after initially disliking the genre for its use of vulgarity. After adopting the name Lupe Fiasco and recording songs in his father's basement, 19-year-old Fiasco joined a group called Da Pak. The group disbanded shortly after its inception, and Fiasco soon met rapper Jay-Z who helped him sign a record deal with Atlantic Records. In 2006, Fiasco released his debut album Lupe Fiasco's Food & Liquor on the label, which received three Grammy nominations. He released his second album, Lupe Fiasco's The Cool, in December 2007. The lead single "Superstar" peaked at number 10 on the Billboard Hot 100. He released Lasers on March 8, 2011 after a two-year delay. The album's lead single "The Show Goes On" peaked at number 9 on the chart, thus becoming his most successful single since "Superstar".

Guy Theodore Sebastian (born 26 October 1981) is an Australian pop, R&B, and soul singer-songwriter who was the first winner of Australian Idol in 2003. Since 2010 he has been a judge on Australia's The X Factor. Sebastian has released six top ten platinum/multi-platinum albums, including a number one and two. He has also released 11 top 15 singles, including eight top tens, with five achieving number one. He has the most number one singles for an Australian male artist in Australian music history, and is equal third overall for all Australian acts. Four of his singles have reached multi-platinum certification, with "Angels Brought Me Here", "Who's That Girl" and "Don't Worry Be Happy" achieving 4× platinum. "Angels Brought Me Here" was the highest selling song in Australia last decade. With 30 platinum and two gold certifications and combined album and single sales of over 2.2 million in Australia, Sebastian has the highest certifications and sales of any Australian Idol contestant.

"Angels Brought Me Here" also reached number one in four Asian countries and New Zealand. Sebastian had a second number one in New Zealand with "Who's That Girl", two other top ten singles and a number three album, and gained four platinum and two gold certifications there. He has worked with a number of well-known American musicians. He co-wrote songs with Brian McKnight and Robin Thicke for his album Beautiful Life, which also included a duet with Mýa. The Memphis Album was recorded with members of the MGs including Steve Cropper, and they were his band on his 2008 Australian tour. Like It Like That has three tracks with John Mayer on guitar and backing vocals, and "Art of Love" featuring Jordin Sparks. "Who's That Girl" from his album Twenty Ten features US rapper Eve.

Samuel William Christopher Watson (born March 7, 1974 in Kansas City, Missouri) better known by his stage name Krizz Kaliko, is an American rapper and singer. He is a long time collaborator with fellow hometown native, Tech N9ne, and is signed to the label that Tech co-owns, Strange Music.

Krizz Kaliko began his musical career in the late 1990s when he began working with a local producer by the name of IcyRoc Kraven. Another local rapper by the name of Tech N9ne was also collaborating with IcyRoc at the time, which led to the two rappers meeting. Tech N9ne was currently working on a song titled "Who You Came To See" and Krizz made a comment that the song could have a better hook. Tech offered up the opportunity to prove his case, and Tech was blown away when Kaliko proved just that. Tech would bring Kaliko into his "inner circle" which would eventually result in Kaliko signing to the label co-owned by his new found friend.

Since then, Kaliko has often contributed to albums put out by Tech N9ne, be it being featured as a rapper or simply providing background vocals for the tracks on the album. Although the largest portion of his work is that of his collaborations with Tech, he has also performed similar tasks for fellow labelmates Kutt Calhoun, Skatterman & Snug Brim, and Prozak. Other collaborations include tracks with the Kottonmouth Kings, Potluck, E-40, T-Pain and Twiztid.