Problem: David Jon Gilmour, (born 6 March 1946) is an English guitarist, singer and songwriter best known as a longtime member of the progressive rock band Pink Floyd. He joined the group as guitarist and co-lead vocalist in 1968, effectively as a replacement for founder member Syd Barrett, who was dismissed from the band shortly afterwards. Pink Floyd subsequently achieved international success with the concept albums The Dark Side of the Moon, Wish You Were Here, Animals, and The Wall. By the early 1980s, they had become one of the most critically acclaimed and best-selling acts in the history of popular music; it was estimated that by 2012 the band had sold over 250 million records worldwide, including 75 million units sold in the United States.

Gilmour was responsible for bringing Kate Bush to public attention. While she was still at school, her family produced a demo tape with over 50 of her compositions, which was turned down by record labels. Gilmour received a copy of the demo from Ricky Hopper, a mutual friend of Gilmour and the Bush family. Impressed with what he heard, Gilmour helped the sixteen-year-old Bush get a more professional-sounding demo tape recorded that would be more saleable to the record companies. Three tracks in total were recorded and paid for by Gilmour. The tape was produced by Gilmour's friend Andrew Powell (who would go on to produce Bush's first two albums) and sound engineer Geoff Emerick. Gilmour then arranged for EMI executive Terry Slater to hear the tape. Slater was impressed by the tape and signed her. Gilmour is credited as executive producer on two tracks on her debut album The Kick Inside, including her second single "The Man with the Child in His Eyes". He performs backing vocals on "Pull Out the Pin", on her fourth album, The Dreaming, and plays guitar on "Love and Anger" and "Rocket's Tail" on her sixth, The Sensual World. In March 1987, Bush, notorious for the rarity of her live performances, sang "Running Up That Hill" at The Secret Policeman's Third Ball with Gilmour on guitar. A three DVD set of The Secret Policeman's Balls benefit concerts that includes their performance was released in 2009. In 2002, she performed "Comfortably Numb", singing the part of the doctor, at Gilmour's concert at the Royal Festival Hall in London.

What is the secret policemans balls?

Answer with quotes: Bush, notorious for the rarity of her live performances, sang "Running Up That Hill" at The Secret Policeman's Third Ball

Problem: Corey Todd Taylor (born December 8, 1973) is an American musician, singer, songwriter, actor, and author, best known as the lead singer and lyricist of the bands Slipknot and Stone Sour. Taylor formed Stone Sour in 1992, playing in the Des Moines area, and working on a demo. He joined Slipknot in 1997 to replace their original vocalist and has subsequently released five studio albums with them. After the first two Slipknot albums went Platinum, Taylor revived Stone Sour to record an album and tour in 2002.

In Des Moines, Iowa, Joey Jordison, Shawn Crahan, and Mick Thomson approached him asking him to join Slipknot. He agreed to go to one of their practices, and ended up singing in front of them. Of Slipknot's nine members, Corey was the sixth to join the band. Performing with Slipknot, he would also come to be known as "Number Eight", being that the band follows a numbering scheme for its members, ranging from 0-8. According to Shawn Crahan, Corey wanted number eight, because it symbolizes infinity. Feeling he could expand more inside Slipknot than in Stone Sour, Taylor temporarily quit Stone Sour, even though they were recording an album with Sean McMahon. Taylor's first gig with Slipknot was on August 22, 1997, which according to band members did not go well. During his first gig, Taylor did not perform wearing a mask; however, for his second show nearly a month later, Corey wore a mask that resembles his debut album mask. Taylor's current mask was described by MTV's Chris Harris as looking "as though it were made of dried, human flesh--like Leatherface, if only he used moisturizer." Taylor has recorded with Slipknot since the release of their second demo album, a self-titled demo used to promote the band to prospective labels and producers. As permanent vocalist, he recorded with Slipknot at Indigo Ranch in Malibu, California and released Slipknot, the band's debut album that peaked number one on the Top Heatseekers chart, went double platinum in the United States, and was included in the 2006 book 1001 Albums You Must Hear Before You Die. Taylor was accused of copyright infringement, regarding the lyrics of the song "Purity", but no action was taken. Taylor began recording for their second studio album, Iowa, in 2001 at Sound City and Sound Image in Van Nuys, Los Angeles. It was released August 28, 2001 and peaked number one on the UK Albums Chart, as well as number three on the Billboard 200. While writing Vol. 3: (The Subliminal Verses), Taylor decided to write lyrics that would not warrant an explicit label. It peaked number two on the Billboard 200. All Hope Is Gone was the first Slipknot album to peak number one on the Billboard 200.

What is Slipknot known for?

Answer with quotes:
the band's debut album that peaked number one on the Top Heatseekers chart, went double platinum in the United States,