Zepparella (photo: Carolyn McCoy) Words by Carolyn McCoy Rock and roll, it’s good for the soul, as they say, and I wholeheartedly support that statement as the truth. There is a fabulous feeling of having shredding guitars and thumping bass lines push all the crazy out of your head — like therapy but cheaper, that’s for sure. So with that in mind, I entered into Mill Valley’s famed Sweetwater Music Hall so I could subject myself and my internal demons to the ultimate therapeutic process of a double-bill of killer rock and roll: Zepparella and the opening act of Gretchen Menn [...]