Chicago have many albums that are underrated by even their own fanbase (as well as several that are deservedly maligned), but this one has to be their most underrated release of all. Until this Rhino reissue it has suffered from the worst sound quality of any of their albums, but that can only partially account for its reputation.
For me this is the first great single disc the band released. V was a near miss, and VI had some great moments, but this album proved that they didn't need two whole discs to stretch out on to create a masterpiece. "Harry Truman" was a questionable choice for first single, but Robert Lamm's other contributions are very strong, especially the neglected gem "Long Time No See". Terry Kath contributes two very different compositions, the 2 minute ballad "Till We Meet Again" and the 7 minute Hendrix-inspired rocker "Oh Thank You Great Spirit", surely the albums centrepiece, despite the absence of the horn section.
James Pankow's efforts, the chart entries "Brand New Love Affair" and "Old Days" are also superb, the latter one of the last uptempo songs to be a true hit for the band. And generic or not, it's nice to hear Peter Cetera rock out on "Hideaway".
This is definitely high up on my Chicago top ten. And unlike on their reissues of CTA, II, or III Rhino have improved the sound so much that this edition should be the only one you should seriously consider buying. The bonus tracks are a nice addition too.