~150 pages in. So far a very approachable review of 20th century music. Predominantly on the "classical" side, but with many stories on how different styles and different classifications have interbred. I think I recommend it to anyone interested, but I also have noticed that many of the refs in the book have been refiring my music history class synapses. YMMV. He's got streaming excerpts on his web page, but while reading I seldom stop to take advantage. Accessible knowledge is sometimes an inconvenient interruption.