Keys is the co-founder and Global Ambassador of Keep a Child Alive, a non-profit organization that provides medicine, orphan care, and social support to families with HIV and AIDS in Africa and India. Keys was born during a time when the AIDS epidemic was gaining a lot of attention in the United States. She was first affected by the HIV/AIDs crisis at 8 years old when her mother's friend died from the disease. She discovered first-hand the extensive impact of the AIDS epidemic years later on a visit to South Africa, a trip that was the impetus to cofounding Keep a Child Alive. Keys had befriended AIDS activist Leigh Blake, who had reached out to her and helped raise her awareness to the global impact of HIV/AIDS. Keys and Leigh visited South African clinics with HIV-infected mothers and children, where Keys encountered the lack of resources and education on the disease present in the communities. Keys visited other African countries such as Uganda and Kenya to promote care for children affected by AIDS. Her work in Africa was recorded in the documentary Alicia in Africa: Journey to the Motherland which was released in April 2008.Keys hosts and is the musical director of Keep A Child Alive's annual fundraising gala called the Black Ball. Every year, artists and other celebrities come together to support and perform to raise funds for the cause. The Black Ball has featured performances from an array of artists including David Bowie, Bono, Pattie Smith, Annie Lennox, Mary J. Blige, Jay-Z, John Mayer, Beyonce, Adele, Justin Timberlake, Carole King, and Roy Ayers. Activists and philanthropists have also been honored at the Black Ball, including Oprah, former President Bill Clinton, Clive Davis, Youssou N'Dour, Sir Richard Branson, and Bono. According to Keys, the Black Ball held in 2014 raised around 2.4 million dollars. Keys and U2 lead singer Bono recorded a cover version of Peter Gabriel and Kate Bush's "Don't Give Up" to raise funds for Keep a Child Alive. Their version of the song was retitled "Don't Give Up (Africa)" to reflect the nature of the charity it was benefiting.In 2005, Keys performed in Philadelphia, Pennsylvania, as part of the worldwide Live 8 concerts to raise awareness of the poverty in Africa and to pressure the G8 leaders to take action. In November 2006, Keys joined David Bowie for what would turn out to be his final live performance at a fundraising event in New York's Hammerstein Ballroom, where they sang a three-song set which included "Changes". In June 2011, Keys spoke alongside musician Annie Lennox at the United Nations AIDS conference in New York. She participated in a panel titled "HIV Priorities for Positive Change: In Women's Words", in which she calls on supporting organizations that provide treatment and care for families affected by AIDS. Empowering the next generation of women, she says, would greatly aid in the end to the disease.Keys performed Donny Hathaway's 1973 song "Someday We'll All Be Free" at the America: A Tribute to Heroes televised benefit concert following the September 11 attacks. Keys protested at the New York City Hall against proposed budget cuts for students' education in June 2002. Keys has also donated to Frum tha Ground Up, a non-profit organization that aids children and teenagers with scholarships. In 2005, Keys performed on ReAct Now: Music & Relief and Shelter from the Storm: A Concert for the Gulf Coast, two benefit programs that raised money for those affected by Hurricane Katrina. In July 2007, Keys and Keith Urban performed The Rolling Stones' 1969 song "Gimme Shelter" at Giants Stadium in East Rutherford, New Jersey at the American leg of the Live Earth concerts.

Question: Who is the singer of U2?
Answer: Bono