Levon Helm already had a lot of miles on him by 1980. Over the ensuing thirty years, he would travel fewer miles, but the wear and tear would still be great. The man who could drum and sing like no other suffered physically, financially and personally. He battled cancer. He battled his bandmate. He settled in Woodstock. Lost in his rich and complex story is “American Son,” the out of print, raucous, joyous, flawed album that is hard to think about but so easy to feel.