Please answer the following question: Information: - Progressive rock (shortened as "prog"; sometimes "art rock", "classical rock" or "symphonic rock") is a broad subgenre of rock music that developed in the United Kingdom and United States throughout the mid to late 1960s. Initially termed "progressive pop", the style was an outgrowth of psychedelic bands who abandoned standard pop traditions in favour of instrumentation and compositional techniques more frequently associated with jazz, folk or classical music. Additional elements contributed to its "progressive" label: lyrics were more poetic, technology was harnessed for new sounds, music approached the condition of "art", and the studio, rather than the stage, became the focus of musical activity, which often involved creating music for listening, not dancing. - Hertford is the county town of Hertfordshire, England, and is also a civil parish in the East Hertfordshire district of the county. Forming a civil parish, the 2011 census put the population of Hertford at about 26,000. - Ian Gillan ( born 19 August 1945 ) is an English singer and songwriter . He originally found commercial success as the lead singer and lyricist for Deep Purple . Initially influenced by Elvis Presley , Gillan started and fronted several local bands in the mid-sixties , and eventually joined Episode Six when their original singer left . He first found widespread commercial success after joining Deep Purple in 1969 . After an almost non-stop workload , during which time he recorded six albums in four years , and problematic relationships with other band members , particularly guitarist Ritchie Blackmore , Gillan resigned from the band in June 1973 , having given a lengthy notice period to their managers . After a short time away from the music business , he resumed his music career with solo bands the Ian Gillan Band and Gillan , before a year - long stint as the vocalist for Black Sabbath . He rejoined a reformed Deep Purple in 1984 , but was fired in 1989 . He rejoined the band for a second time in 1992 for their twenty - fifth anniversary , and following the recruitment of guitarist Steve Morse in 1994 , has helped transform the group into a regular touring outfit , which he has fronted ever since . In addition to his main work -- performing with Deep Purple and other bands during the 1970s and 1980s -- he sang the role of Jesus in the original recording of Andrew Lloyd Webber 's rock opera Jesus Christ Superstar , performed in the charity supergroup Rock Aid Armenia , and engaged in a number of business investments and ventures , including a hotel , a motorcycle manufacturer , and music recording facilities at Kingsway Studios . More recently , he has performed solo concerts concurrently with his latter career in Deep Purple , and his work and affinity with Armenia , combined with his continued friendship with Tony Iommi since his brief time in Black Sabbath , has led him to form the supergroup WhoCares with Iommi . His solo career outside of Deep Purple was given a comprehensive overview with the Gillan 's... - Deep Purple are an English rock band formed in Hertford in 1968. They are considered to be among the pioneers of heavy metal and modern hard rock, although their musical approach changed over the years. Originally formed as a progressive rock band, the band shifted to a heavier sound in 1970. Deep Purple, together with Led Zeppelin and Black Sabbath, have been referred to as the "unholy trinity of British hard rock and heavy metal in the early to mid-seventies". They were listed in the 1975 "Guinness Book of World Records" as "the globe's loudest band" for a 1972 concert at London's Rainbow Theatre, and have sold over 100million albums worldwide. - Led Zeppelin were an English rock band formed in London in 1968. The group consisted of guitarist Jimmy Page, singer Robert Plant, bassist and keyboardist John Paul Jones, and drummer John Bonham. The band's heavy, guitar-driven sound, rooted in blues and psychedelia on their early albums, has earned them recognition as one of the progenitors of heavy metal, though their unique style drew from a wide variety of influences, including folk music. - Rainbow Theatre (originally Astoria Theatre) is a Grade II*-listed building located in Finsbury Park, London, England. Built as a cinema in 1930, it later became well known as a music venue and is now a Pentecostal church. What entity does 'ian gillan' has the relation 'country of citizenship' with?
Answer:
england