Chicago

According to Billboard chart statistics, Chicago is second only to the Beach Boys as the most successful American rock band of all time, in terms of both albums and singles. Judged by album sales alone, as certified by the R.I.A.A., the band does not rank quite so high, but it is still among the Top Ten best-selling U.S. groups ever. If such statements of fact surprise, that's because Chicago has been singularly underrated since the beginning of its long career, both because of its musical ambitions -- to the musicians, rock is only one of several styles of music to be used an...