My birthday present to myself today was some of my favorite music — unadulterated, passionate, off the rails — on my drive back from Stillwater. Bob Mould sounds completely unhinged on this track from “Silver Age,” which came out when he was 52. “The Descent” addresses losing hope and throwing it all in the fire. While the content isn’t a reflection of my mental state, the noise and aggression here are a good indication of what rock ‘n roll means to me. Even at 53.