Supertramp were an English rock band formed in London in 1970. Marked by the individual songwriting of founders Roger Hodgson (vocals, keyboards, guitar) and Rick Davies (vocals, keyboards), they are distinguished for blending progressive rock and pop styles, and for a sound that relied heavily on Wurlitzer electric piano. The group's line-up changed numerous times throughout their career, with Davies the only consistent member. Other longtime members included bassist Dougie Thomson, drummer Bob Siebenberg and saxophonist John Helliwell. The band were initially a full-fledged prog-rock group, but starting with their third album Crime of the Century (1974), they began moving towards a more pop-oriented sound. They reached their commercial peak with 1979's Breakfast in America, which yielded the international top 10 singles "The Logical Song", "Breakfast in America", "Goodbye Stranger" and "Take the Long Way Home". Their other top 40 hits included "Dreamer" (1974), "Give a Little Bit" (1977) and "It's Raining Again" (1982). In 1983, Hodgson left the group to pursue a solo career. Davies took over as the band's sole leader until 1988, after which they disbanded and periodically reformed in various configurations. As of 2007, Supertramp album sales exceeded 60 million. They attained significant popularity in North America, Europe, South Africa and Australia. Their highest sales levels were in Canada, where they had two diamond-certified (ten-times platinum) albums (Crime of the Century and Breakfast in America), and their only number 1 singles anywhere ("The Logical Song" and "Dreamer").