Adam Richard Wiles (born 17 January 1984), better known by his stage name Calvin Harris, is a Scottish DJ, singer, songwriter, and record producer. His gold-selling debut album, I Created Disco, was released in 2007 and contained the top ten singles "Acceptable in the 80s" and "The Girls". His second studio album, Ready for the Weekend (2009), reached number one in the UK Album Chart and includes the chart-topper "I'm Not Alone", the UK top five hit "Ready for the Weekend", and the singles "Flashback" and "You Used to Hold Me".

A remix album titled L.E.D. Festival was released in July 2010 as a free album in the August issue of Mixmag. Harris is currently working on his third studio album—due for release in 2012—which has produced the singles "Awooga", "Bounce", "Feel So Close", and "Let's Go". He has written and produced records for other recording artists including Kylie Minogue, Sophie Ellis-Bextor, Dizzee Rascal, Rihanna (on the international chart topper "We Found Love"), and Kesha.

Marco Sfogli (born April 4, 1980) is an Italian rock guitarist. He has appeared on several albums.

Born in 1980, his first attempt with music came in 1984 when he played with his parents (both musicians) in Schwetzingen, Germany during an encore. But the story starts in 1989 when he received his first electric guitar as a gift: "a Washburn but I don't remember the model". He started to play along with his heroes (Michael Jackson, Van Halen, Europe), while other kids his age usually preferred to play soccer. In 1992 he left the guitar to study the drums, another huge passion. "Being a drummer first and a guitarist second, helped me a lot in terms of creativity and rhythmic knowledge." In 1996 he left the drums because of his growing interest in guitar, especially after an intense listening of Images and Words by Dream Theater. Today, he's a guitar player, a composer and an arranger. He worked for a lot of artists since. In 2005 he flew to Canada to record James LaBrie's third solo release titled Elements of Persuasion which has become a hit with progressive metal fans. Now member of the James LaBrie band, he put out his first solo record titled There's Hope on Feb. 15th 2008 through Lion Music. He also worked on the James LaBrie record Static Impulse as guitar player, co-writer and engineer. Currently he's touring with a NY based band named Creation's End.

Justin Drew Bieber ( /ˈbiːbər/ BEE-bər, born March 1, 1994) is a Canadian Pop/R&B singer-songwriter, musician, and actor. Bieber was discovered in 2008 by Scooter Braun, who came across Bieber's videos on YouTube and later became his manager. Braun arranged for him to meet with Usher in Atlanta, Georgia, and Bieber was soon signed to Raymond Braun Media Group (RBMG), a joint venture between Braun and Usher, and then to a recording contract with Island Records offered by L.A. Reid. Bieber's debut single, "One Time", was released in 2009 and peaked in the top twenty in Canada and charted in the top thirty in several international markets. His debut album, the seven-track EP My World, followed in November 2009, and was soon certified platinum in the United States. He became the first artist to have seven songs from a debut album chart on the Billboard Hot 100.