Background: Troyal Garth Brooks (born February 7, 1962) is an American singer and songwriter. His integration of rock and roll elements into the country genre has earned him immense popularity in the United States. Brooks has had great success on the country single and album charts, with multi-platinum recordings and record-breaking live performances, while also crossing over into the mainstream pop arena. According to the RIAA, he is the best-selling solo albums artist in the United States with 148 million domestic units sold, ahead of Elvis Presley, and is second only to the Beatles in total album sales overall.
Context: In 1993, Brooks, who had criticized music stores selling used CDs since it led to a loss in proper royalty payments, persuaded Capitol Records to not ship his 1993 album, In Pieces, to stores which engaged in this practice. This led to several anti-trust lawsuits against the record label, ending with Capitol shipping the albums to the stores anyway.  Despite the delay in shipping, In Pieces was another success, peaking at No. 1 on both the Billboard 200 and Top Country Albums charts, and selling a total of nearly 10 million copies. After a delay in its worldwide release, the album also peaked at No. 2 on the United Kingdom Albums Chart. That same year, "The Red Strokes" became Brooks' first single to make the UK Singles Chart, reaching a high of No. 13; it was followed by "Standing Outside the Fire", which reached No. 23. Previous albums No Fences, Ropin' the Wind and The Chase also remained in the top 30 in the UK Albums Chart.  Brooks' first world tour began in 1993, reaching the UK after many domestic concerts. Brooks sold out venues such as Birmingham's National Exhibition Centre and London's Wembley Arena, a feat never accomplished by an American country music artist. He also began the London radio station, Country 1035. Despite the disdain of the British media, Brooks' overall popularity in the country was evident, with a top disc jockey, Nick Barraclough, referring to Brooks as Garth Vader (a play on Darth Vader) for his "invasion" of the charts and his success in the country genre. Unlike Alan Jackson, who refused to return to the UK after being treated in a similar negative manner by the press, Brooks would later return in 1996 for more performances. Brooks also took is World Tour to other regions throughout Europe, as well as Brazil, the Far East, Australia, and New Zealand.  In 1994, Brooks paid homage to one of his musical influences, Kiss, appearing on the tribute compilation, Kiss My Ass: Classic Kiss Regrooved, a collection of songs performed by popular artists from various genres. The unlikely collaboration of Brooks and Kiss' rendition of "Hard Luck Woman" was performed live on The Tonight Show with Jay Leno, and despite its hard-rock appeal, Brooks' version appeared on the Billboard Hot Country Songs chart.
Question: Were there any significant events during his tour?
Answer: Brooks sold out venues such as Birmingham's National Exhibition Centre and London's Wembley Arena, a feat never accomplished by an American country music artist.

Problem: Background: Carlos Santana  audio  (born July 20, 1947) is a Mexican and American musician who first became famous in the late 1960s and early 1970s with his band, Santana, which pioneered a fusion of rock and Latin American jazz. The band's sound featured his melodic, blues-based guitar lines set against Latin and African rhythms featuring percussion instruments such as timbales and congas not generally heard in rock music. Santana continued to work in these forms over the following decades. He experienced a resurgence of popularity and critical acclaim in the late 1990s.
Context: Carlos Santana's distinctive guitar tone is produced by PRS Santana signature guitars plugged into multiple amplifiers. The amps consist of a Mesa Boogie Mark I, Dumble Overdrive Reverb and more recently a Bludotone amplifier. Santana compares the tonal qualities of each amplifier to that of a singer producing head/nasal tones, chest tones, and belly tones. A three-way amp switcher is employed on Carlos's pedal board to enable him to switch between amps. Often the unique tones of each amplifier are blended together, complementing each other producing a richer tone.  He also put the "Boogie" in Mesa Boogie. Santana is credited with coining the popular Mesa amplifier name when he tried one and exclaimed, "That little thing really Boogies!"  Specifically, Santana combines a Mesa/Boogie Mark I head running through a Boogie cabinet with Altec 417-8H (or recently JBL E120s) speakers, and a Dumble Overdrive Reverb and/or a Dumble Overdrive Special running through a Brown or Marshall 4x12 cabinet with Celestion G12M "Greenback" speakers, depending on the desired sound. Shure KSM-32 microphones are used to pick up the sound, going to the PA. Additionally, a Fender Cyber-Twin Amp is mostly used at home.  During his early career Santana used a GMT transistor amplifier stack and a silverface Fender Twin. The GMT 226A rig was used at the Woodstock concert as well as during recording Santana's debut album. During this era Santana had also begun to use the Fender Twin, which was also used on the debut and proceedingly at the recording sessions of Abraxas.
Question: What is a three-way amp switcher?
Answer:
enable him to switch between amps.