British singer-songwriter Adele has released two studio albums, one extended play and eight singles. She reached commercial success in the United Kingdom when her debut album, 19, reached number one on the UK Albums Chart, and her single, "Chasing Pavements", reached number two on the UK Singles Chart. Other singles released included "Hometown Glory", "Cold Shoulder", and "Make You Feel My Love". Her second album, 21, was released in January 2011 and was immediately certified platinum by the British Phonographic Industry while debuting at number one. 21 has spent 23 weeks atop the Billboard 200 since its U.S. release. The album's first single, "Rolling in the Deep", also reached number two in the UK and became her first number one on the US Billboard Hot 100. The second single, "Someone Like You", was released in February 2011 and peaked at number one in the UK and Ireland, her first in her home country. It also became her second number one in the US. "Set Fire to the Rain" was released as the second single off the album in the rest of Europe and became her third number one in the US.

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.

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".