IMO, the term progressive rock should only refer to the difference that a piece of Rock music makes relative to the music that is being created at that time. The term progressive has more strength if there is difference for all time. The debate as to what kind of difference is progressive will go on forever, but there must be a difference. Difference can be created by combining elements which are familiar in an unfamiliar way. There is no doubt in my mind that Ambrosia met the full strength of this aspect of the definition of the term progressive. While modern progressive rock has elements which are retrogressive, I see elements from the 60s, 70s, 80s and 90's combined to make in a synergistic way, different rock music than the regurgitation of mainstream rock.
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