Problem: Background: 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.
Context: 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.
Question: How did he get involved with Slipknot?
Answer: In Des Moines, Iowa, Joey Jordison, Shawn Crahan, and Mick Thomson approached him asking him to join Slipknot.

Problem: Background: John Glascock (2 May 1951 - 17 November 1979) was the bass guitarist, backing vocalist, and occasional lead vocalist for the progressive rock band Carmen. He was also the bass guitarist and backing vocalist for the progressive rock band Jethro Tull from December 1975 until August 1979. He died in 1979, at the age of 28, as a result of a congenital heart valve defect, which was worsened by an infection caused by an abscessed tooth. In a September 1978 'Guitar Player' interview, Ritchie Blackmore had said "...
Context: Glascock then joined Jethro Tull in 1976, after having met Ian Anderson when Carmen opened several dates for Jethro Tull on their War Child tour. Martin Barre said in the "Classic Artists Series" documentary, that his love for the band was unique, being a fan of Jethro Tull playing in the band. He played on the Jethro Tull albums Too Old to Rock 'n' Roll: Too Young to Die! (1976), Songs from the Wood (1977), Heavy Horses (1978), Bursting Out (1978), and on three tracks on Stormwatch (1979). In Jethro Tull he received no writing credits but sang backing vocals, and became the first harmony vocalist Jethro Tull had. He even sang on the album he was not credited on, Heavy Horses (1978).  Glascock replaced the longtime friend of Ian Anderson, Jeffrey Hammond. He also played electric guitar on-stage when Anderson's arrangement required it, as for instance in performances of "Skating Away (On the Thin Ice of the New Day)" from the Bursting Out live album, when the rest of the band was playing xylophone, glockenspiel and percussion.  Glascock's health problems became apparent when he was unable to complete the U.S. leg of the Heavy Horses tour, missing a transatlantic simulcast from Madison Square Garden. He played his last gig on 1 May 1979, in San Antonio, Texas, three years to the day of his first gig with Jethro Tull. Despite the diagnosis of heart valve damage caused by an infection, he continued his previous lifestyle, which involved heavy drinking, marijuana usage, and wild parties. His health continued to deteriorate. Ian Anderson gave him several warnings before finally laying him off with pay during the production of Stormwatch (1979), completing most of the bass guitar parts himself. During the subsequent promotional tour with replacement bass player Dave Pegg, Anderson learned of Glascock's death and had to break the news to the rest of the band. Glascock's close friend, drummer Barriemore Barlow, was devastated and left the band at the end of the tour. Mark Craney replaced Barlow.  The resulting dislocation, Ian Anderson's own artistic vision, and a decision from the label, prompted a complete overhaul of the lineup, leaving only Anderson and Martin Barre as full members, though Glascock's touring replacement on bass (Dave Pegg) was retained for the band's follow-up album in 1980.
Question: Did they tour?
Answer:
when he was unable to complete the U.S. leg of the Heavy Horses tour,