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AI Summary
- Chicago's 1969 debut blended brass, jazz sophistication, and rock power; by 1975 their Greatest Hits compilation became one of the decade's best-selling albums
- 50th anniversary expanded edition of Chicago IX celebrates the band's experimental late '60s spirit and '70s pop sensibility
- Lee Loughnane and Jimmy Pankow discuss incorporating horn section into rock band and explain their approach to constant touring since the '70s