The iconic Canadian singer-songwriter (pictured) has passed away at the age of 84. But Willie Nelson is going strong at 90, albeit "California Sober," and he celebrated with a star-studded birthday concert last weekend in L.A.. Doc Watson would have been 100 in March, so a new tribute album -- I Am a Pilgrim -- has appeared. And Brother Bill digs into traditional and not-so-traditional renditions of British ballads.
