Before the gold and platinum albums, before the MTV hits and critical renown, power-pop and alternative-rock pioneer Matthew Sweet was just a 13-year-old bass player sitting alone in his Nebraska bedroom, daydreaming of a life spent making music. “I was just starting to write songs and play a little guitar and I had this thought: I wonder if when I’m old and I’ve been around music a really long time, I might suddenly just be able to play lead guitar without ever properly learning how.