See the Special Issue in Work and Occupations on “Artistic Careers” in Work and Occupations, Nov. 2013.  http://wox.sagepub.com/content/40/4.toc and the podcast interview of special-issue contributor Kristin Thomson, Co-Director of the Future of Music Coalition’s “Artist Revenue Streams project”:   http://wox.sagepub.com/site/misc/Index/Podcasts.xhtml