Curved Air are a pioneering British progressive rock group formed in 1970 by musicians from mixed artistic backgrounds, including classical, folk, and electronic sound. The resulting sound of the band was a mixture of progressive rock, folk rock, and fusion with classical elements. Along with High Tide and East of Eden, Curved Air were one of the first rock bands after It's a Beautiful Day and The United States of America to feature a violin. Considered (according to AllMusic) "one of the most dramatically accomplished of all the bands lumped into Britain's late-'60s prog explosion", Curved Air released eight studio albums (the first three of which broke the UK Top 20) and had a hit single with "Back Street Luv" (1971) which reached number 4 in the UK Singles Chart.