I was just wondering what people thought would be candidates for consecutive albums by the same band in which the change in sound was the most stark. It's interesting to think about, since this is really the most creative period of '70s prog and many bands were growing in sophistication and finding their identity in steps. Sometimes, though, the changes present on a new album from the ones prior to it are several steps at a time and very noticeable - either due to personnel changes, a new creative direction, etc.
Any nominations? I kind of thought of Jethro Tull from Aqualung to Thick as a Brick when thinking about this. The opening acoustic part isn't much of a derivation, but once the main body of the first section kicks in, it does not sound very much like the hard rock, riff-based Aqualung/Benefit style.
Soft Machine from Seven to Bundles is another example.
Maybe Genesis from SEBTP to Lamb Lies Down on Broadway.
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