Shayne Thomas Ward,born 16 October 1984 in Manchester, England, is an English pop singer who rose to fame as the winner of second series of The X Factor. He has sold over three million records worldwide and has had number one albums and singles in nine countries. During The X Factor competition, Ward was mentored by manager Louis Walsh. The Bookies' favourite to win the show, he defeated duo Journey South and singer Andy Abraham in the final screened by ITV1 by a margin of 1.2% of the vote, out of a reputed 10.8 million phone votes cast by viewers. His first single, "That's My Goal", was released in the United Kingdom on December21, 2005 and became the last number one of 2005, hitting the top spot on 31 December. It sold 313,000 copies on its first day of sales, making it the third fastest selling single of all time, behind Elton John's "Candle in the Wind" and Will Young's "Evergreen", which sold 685,000 and 400,000 copies in their first days of sale respectively. Ward's prize, as winner, was a recording contract with Simon Cowell's Syco record label, which is co-owned by Sony Music Entertainment. The contract had a stated value of £1 million, of which £150,000 was a cash advance and the remainder was allocated to recording and marketing costs.

Jesse McCartney (born April 9, 1987) is an American singer-songwriter, actor, and voice actor. McCartney achieved fame in the late 1990s on the daytime drama All My Children as JR Chandler. He later joined boy band Dream Street, and eventually branched out into a solo musical career. Additionally, McCartney has appeared on shows such as Summerland and Greek. McCartney also is known for lending his voice as Theodore in Alvin and the Chipmunks and its sequels, as well as voicing the characters Roxas and Ventus in the video games series Kingdom Hearts developed by Square Enix.

McCartney was born on April 9th in Westchester, New York, the son of Ginger (née Sarber) and Scott McCartney. He began performing in local community musicals at the age of seven, before joining the national tour of The King and I at age ten along with Phil of the Future star Ricky Ullman. Here he played the character of Louis. In 1998, he sang with the group Sugar Beats and can be heard on their 1998, 1999, and 2000 CD releases.

Peter Gene Hernandez (born October 8, 1985), better known by his stage name Bruno Mars, is an American singer-songwriter and record producer. Raised in Honolulu, Hawaii by a family of musicians, Mars began making music at a young age. He performed in various musical venues in his hometown throughout his childhood. He graduated from high school and then moved to Los Angeles, California to pursue a musical career. Mars produced songs for other artists, joining production team The Smeezingtons.

Mars had an unsuccessful stint with Motown Records, but then signed with Atlantic Records in 2009. He became recognized as a solo artist after lending his vocals and co-writing the hooks for the songs "Nothin' on You" by B.o.B, and "Billionaire" by Travie McCoy. He also co-wrote the hits "Right Round" by Flo Rida featuring Ke$ha, and "Wavin' Flag" by K'naan. In October 2010, he released his debut album, Doo-Wops & Hooligans. Anchored by the worldwide number-one singles "Just the Way You Are" and "Grenade", the album peaked at number three on the Billboard 200. Mars was nominated for seven Grammys at the 53rd Grammy Awards, winning Best Male Pop Vocal Performance for "Just the Way You Are".

James Hillier Blount (born 22 February 1974), better known by his stage name James Blunt, is an English singer-songwriter and former army officer, whose debut album, Back to Bedlam and single releases, including "You're Beautiful" and "Goodbye My Lover", brought him to fame in 2005. His repertoire can be best described as a mix of acoustic-tinged pop, rock and folk. After recording on the independent American label Custard Records, Blunt won two Brit Awards, two MTV Video Music Awards, two Ivor Novello Awards, and by 2006 was nominated for five Grammy Awards. The following year, he released his second album All the Lost Souls (2007). Blunt's third studio album, Some Kind of Trouble, was released in November 2010. Worldwide, Blunt has sold over 18 million albums, and his debut album, Back to Bedlam, is the best-selling album of the 2000s in the UK.

Blunt was an officer in the Life Guards, a cavalry regiment of the British Army, and served under NATO in Kosovo during the conflict there in 1999. While posted to Kosovo, Blunt was introduced to the work of Médecins Sans Frontières (MSF or "Doctors Without Borders"). Since then, Blunt has supported MSF by holding meet-and-greet auctions at many of his concerts.