I couple of weeks back I happened to see Janis Ian on Woodsongs and she mentioned her autobiography "Society's Child" which I received in the mail today. In skimming it I ran across mention of her being one of the first outspoken artists to go against the grain and stand up for music downloads and sharing and using it as a means of marketing and increasing sales. You can read the article here:
http://www.janisian.com/reading/internet.php
an excerpt:
...I've found that to be true myself; every time we make a few songs available for free download on my website, sales of all the CDs go up. A lot.
And I don't know about you, but as an artist with an in-print record catalogue that dates back to 1965, I'd be thrilled to see sales on my old catalogue rise!
Even a mention of Baen Books and SFWA in the piece.