While revisionist history suggests that scabrous punk was the soundtrack to late-'70s Britain, the truth is tamer: Supertramp's radio-friendly rock dominated the charts (in the UK and US) for a good decade following the release of 1979's Breakfast In America. But on either side of this imperial phase are curious deep cuts, spanning prog and synth experiments and a number of different lineups. Think you know Supertramp? Think again.