I was not always a fan of prog ("progressive") rock. In its early-to-mid 1970s heyday I was in fact dismissive of it: pretentious, over-complicated, sacrificing good songwriting for an emphasis on virtuosity not really suited for rock music. In short, it seemed to be trying to be something that rock music isn't and shouldn't be: of interest on purely musical grounds, where it was never going to be able to compete with jazz and classical. It was twenty years later that I gave it a second look, for a non-musical reason: my then-adolescent children had gotten interested in popular music (i.e. rock) and I was trying to steer them away from the uglier stuff. 

That didn't work, but it did change my mind. That is, my basic criticisms were justifiable and remained intact, but I enjoyed the music anyway, which led me to listen, in most cases for the first time, to Yes and King Crimson, and to develop quite a liking for them. There were a few others, but I only made a point of hearing most of the 1970s work of those two. And of them, KC seemed to have had the most interesting post-'70s career. 

But that's not really fair. Yes was a band with a fairly consistent lineup and a very consistent sound, at least through their first decade, and seem to have faded away after that, with the exception of one commercially successful and reportedly very atypical album in the early '80s. King Crimson, on the other hand, has not been a proper band at all through much of its fifty-plus years, but rather the ever-changing musical project of Robert Fripp, in which he has included various other musicians as suits his interests and purposes. It's been the exact opposite of consistent lineup and sound--Fripp tended to disband the group, at least partially, after every album or two, and reassemble it, at least partially, and go off in a somewhat different musical direction.

As a band, King Crimson was officially dead as of about 1975. But after half a decade or so Fripp revived the name for a group  of instrumental virtuosos consisting of himself, guitarist Adrian Belew, bass player Tony Levin, and drummer Bill Bruford (formerly of Yes). This band recorded three albums, Discipline (1981), Beat (1982), and Three of A Perfect Pair (1984). 

I would suppose that fans of progressive rock in general and King Crimson in particular were disappointed in these. One of the hallmarks of prog is long compositions with a lot of virtuoso instrumental work, and, despite the very high level of technical skill of all four players, that's not what these albums are. Most of the songs are in fact songs, of fairly typical pop song length, of a piece, with little instrumental stretching out. But that doesn't mean they're simple. They're not great songs as such--you don't come away humming them, or moved by the combination of words and music. But they're interesting. Rather than the complex twists and turns more typical of prog, or the basically simple and repetitive chord changes and beat of most pop, these songs have a static sort of quality--complex, and shifting slowly rather than driving forward. If I felt more confident of my technical understanding of music I would try to describe that more precisely. 

But I can say with confidence that one fairly constant feature is the use of complex repetitive hyperactive guitar figures that slowly shift rhythmically. I find it very hard to follow them for very long. I think I've got it and then suddenly it's wait, where did the accent go? "Frame by Frame," from Discipline, is a good example.

The bass and drums are also doing a lot of complicated things with rhythm there. It's as if the whole emphasis on complexity which characterizes the progressive rock concept is focused on rhythm. Basically, this band invented "math rock" (from Wikipedia) : "a style of alternative and indie rock with roots in bands such as King Crimson and Rush. It is characterized by complex, atypical rhythmic structures (including irregular stopping and starting), counterpoint, odd time signatures, and extended chords. " A week or so ago I found a YouTube video in which Adrian Belew explains this sort of thing, the way the guitar parts shift in and out of phase, so to speak, with one player starting one of these figures, the other playing it but with one note left out, and so on, so that the beat begins to float. But I just spent thirty minutes looking and can't find the video now. 

All this may seem a long way from the long and elaborate suites so often found in '70s prog. But if you listen to "21st Century Schizoid Man," the very first track on the very first KC album, In the Court of the Crimson King (1969), you find that the connecting thread is very clear. 

To call a work of art "interesting" is sometimes to damn with faint praise, at least on my part. And the word does pretty well summarize my opinion of these three albums. But I mean it quite literally. This is not my favorite music, but it is in fact interesting, interesting enough to return to now and then. There seems to be a consensus among critics and fans that the chronological sequence of the three albums is also the sequence of their quality, the first (Discipline) being the best. I agree with that. But if one likes the style at all, they're all worth hearing. 

A group consisting of Belew, Levin, Steve Vai (a name known to anyone interested in rock guitar), and Danny Carey, drummer of the band Tool, is doing a tour under the name BEAT performing this music. They're not coming anywhere very near me, but if they did I'd go.