A while ago, I was sent a link to a course on the music of Frank Zappa, given between 2001 and 2007 by one Jason Klein of the University of North Texas. Browsing around, I stumbled across this PDF (caution: 23MB download), in which one page meticulously visualizes Zappa’s notion of Conceptual Continuity:
The above is just a thumbnail. To study the graph in all its glory, download the big version here (3MB jpg). If bandwidth is no issue, I’ve also uploaded the chart to Flickr for online viewing. Fascinating stuff — someone make a poster out of this!