Mike Murphy looks back at 2012, by featuring music released in the last year (Molasses Creek, Ernest James Zydeco, Ed Gerhard, Iris DeMent, Steep Canyon Rangers) as well as music from those who left us year (Ravi Shankar, Dave Brubeck, Spirit’s Ed Cassidy, The Mothers of Invention’s Ray Collins, The Chieftains’ Martin Fay, Etta James, Levon Helm)