I won't claim to know much about music now, and I even knew less 30 years ago but I always loved APP. The guitar playing was so much cleaner and the music so much more sophisticated than most of what was on the radio. Tales of Mystery and Imagination will always be on my favorites list.
“Sophisticated” is the right word. So is “Intelligent.” I know that Yes was supposedly the band that fit those bills, but APP went far beyond. Under appreciated genius.