A benefit concert or charity concert is a concert, show or gala featuring musicians, comedians, or other performers that is held for a charitable purpose, often directed at a specific and immediate humanitarian crisis. Benefit concerts can have both subjective and concrete objectives. Subjective objectives include raising awareness about an issue such as misery in Africa (see Live 8) and uplifting a nation after a disaster (see America: A Tribute to Heroes). Concrete objectives include raising funds (Live Aid) and influencing legislation (Live 8; Farm Aid). The popularization of benefit concerts started after the Concert For Bangladesh, organized by George Harrison in 1971 . However, the format in which most concerts are done nowadays was only created after the occurrence of Bob Geldof’s Live Aid (CBC). The two largest benefit concerts of all time, in size, were the Live 8 and the Live Earth, both with billion of spectators. Scholars theorize that the observed increase on concert size since the Live Aid is happening because organizes strive to make their events as big as the tragedy at hand, thus hoping to gain legitimization that way.

Thomas Baptiste Morello (born May 30, 1964) is a Grammy Award-winning American guitarist best known for his tenure with the bands Rage Against the Machine, Audioslave, his acoustic solo act The Nightwatchman, and his newest group, Street Sweeper Social Club. Tom is also the co-founder (along with Serj Tankian) of the non-profit political activist organization Axis of Justice, which airs a monthly program on Pacifica Radio station KPFK (90.7 FM) in Los Angeles. He is best known for his unique and creative guitar playing style, which incorporates feedback noises, unconventional picking and tapping as well as heavy use of guitar effects. He was ranked #26 in Rolling Stone's list of the "100 Greatest Guitarists of All Time."

Tom Morello was born on May 30, 1964, in Harlem, New York, to Ngethe Njoroge and Mary Morello. Tom is of Irish and Italian descent on his maternal side, and Kikuyu Kenyan descent on his paternal side. His mother was a schoolteacher from Marseilles, Illinois, who earned a Master of Arts at Loyola University, Chicago and travelled to Germany, Spain, Japan, and Kenya as an English language teacher between 1977 to 1983. His father was a Kenyan participant in the Mau Mau Uprising, and served as Kenya's first ambassador to the United Nations. Morello's paternal great-uncle, Jomo Kenyatta, was the first elected president in Kenyan history. His parents met in August 1963, while attending a pro-democracy protest in Nairobi, Kenya. After discovering her pregnancy, Mary returned to the United States with Njoroge in November, and married in New York City.

Steven Siro Vai (born June 6, 1960) is an American guitarist, songwriter and producer who has sold over 15 million albums. After starting his career as a music transcriptionist for Frank Zappa, Vai recorded and toured in Zappa's band for two years, from 1980 to 1982. He began a solo career in 1983, has released eight solo albums and won three Grammy Awards. He has also recorded and toured with Public Image Ltd., Alcatrazz, David Lee Roth and Whitesnake. Vai has been a regular touring member of the G3 Concert Tour which began in 1996. In 1999 Vai started his own record label Favored Nations, intending to showcase as he describes, "...artists that have attained the highest performance level on their chosen instruments."

Vai began playing guitar in 1973, at the age of 13. In 1974, he took guitar lessons from guitarist Joe Satriani and played in local bands, one of which was called "The Steve Vais". He was influenced by guitarists including Jimi Hendrix, Jeff Beck, Brian May, Jimmy Page, Glen Buxton, and jazz fusion guitarist Allan Holdsworth. Vai attended the Berklee College of Music, afterwards recording a promotional piece for them in which he spoke about auditioning for Frank Zappa at age 20.