Chicago has been swimming in my brain for a long time now. I don't understand why people I talked to (especially them old LP records people) made a fuss about how different they were (at times with another adjective, TOTALLY) way back before Peter Cetera sang for them. Any comprehensive album that you guys would suggest I listen to? By the way, some people I talked to even labeled them as prog rock.
The albums to get are probably the first 5 or 7 albums. Chicago Transit Authority (first album) and Chicago II,III, IV, V, VI, VII. Peter Cetera was a vocalist as far back as the first album (incidentally the only time they were CTA, they were Chicago after that) on the song "Question 67 or 68", its just that he didn't sing as much as guitarist Terry Kath (who had a mean bluesy vocal growl and complex guitar lines with plenty of wah wah pedal thrown in) and keyboardist Robert Lamm. Unfortunately Cetera discovered he could write cheesy hit ballads ("If you leave me now" is the prime offender and their biggest #1 single), after which all thoughts of Chicago as a progressive jazz-rock ensemble flew out the window. Strangely enough Cetera was a very good bassist.
The first album (recorded in 1969!) still stands out as one of their best. Funk, jazz, rock, soul, classical, pop fusion and it doesn't sound dated today.
But in their prime I think Chicago was probably better than Tower of Power and Blood Sweat and Tears. The horn parts (arranged by trombonist James Pankow) were fantastic and you can't remember a Chicago classic without singing the horn parts. Not bad for just 3 guys (trumpet, trombone, sax) who are still part of the band today.
I must give props to Mr. Nancy Brew for recommending the "Live at Carnegie Hall" album (aka Chicago IV, a 4-LP set when it was released sometime 1971). I had never heard it before until a couple of days ago when I discovered it over the Net. It is seriously bad ass and all those long jams are as good now as they were in the early 70's. I would recommend playing this to anyone who thinks Chicago was just that cheesy over produced ballad band produced by David Foster in the 80's.