There is more than one artist with this name, including: 1) Magna Carta was a British progressive folk-rock group originally formed in London in April 1969. 2) Magna Carta was a Greek progressive metal band that released just one album in 1990. 3) Magna Carta was an American post-punk band from Saskatoon SK. 1) Magna Carta was a British progressive folk-rock group originally formed in London in April 1969 by Chris Simpson (guitar, vocals), Lyell Tranter (guitar, vocals) and Glen Stuart (vocals).