Not a new book. Published in 2005. There was a thread about it at the time:
http://www.talkawhile.co.uk/yabbse/index.php?topic=16860.0Worth having, if a little dry and academic for the general reader. Britta Sweers (a very approachable lady, in my experience) intended her book to revise and update
The Electric Muse, a more discursive, journalistic study of folk-rock published in the seventies, which is also worth getting hold of if you can find a secondhand copy.
P