I've read a few of Levy's other books, and found him a talented writer on technical subjects. Here, he turns his attention to the iPod, and does a nice job at teasing out its history, development, appeal and impact. Just about everything you might want to know about this remarkable machine is contained in these pages, although Levy doesn't mention the assertion that Steve Jobs' hands-on involvement in its development caused its output to be made somewhat louder, since he is partially deaf.
To be sure, some of these themes are better developed than others: Levy's very good on the hardware development story and the way in which music has become dissociated from its physical medium (LP, CD, etc) through its transformation into computer files. He's also paints a cogent picture of the history of technical developments in this area, and the way in which the tardiness with which the music industry has reacted has brought about its downfall (he points out that their first encounter with every development resulted in them suing the perpetrator, which he thinks is like trying to turn back time). I found his attempts to define "coolness" less convincing, although there can be no doubt that such an epithet applies to the iPod.
And finally, I thought Levy's idea of "spiritually link[ing]" his book to its subject by shuffling the chapters was misguided in the extreme: books aren't like collections of songs because they (usually) only get looked at once, and people only come across a single copy, in which the sequence is fixed. For an author to assert that his chapters could be read in any order doesn't sound like a good recommendation for the structure of his book.