Imagine a worst-case scenario with the flu — sniffles, chills, aching and vomiting. That's what it often feels like to withdraw from heroin and powerful opioids. Medication helps. But writhing in bed is almost always in order. It's not the time most people would turn to songwriting, but as music therapy grows as a method to cope with addiction, it's being used in the depths of detox by a program new to Nashville called Rock to Recovery.