Most bands see their members tackle one, sometimes two duties. The drummer is the only drummer. There is only one choice for a vocalist, etc. But, once in a generation, a wildly talented musician will come along and completely switch up that narrative. The three rockers below are like that. They haven’t always chosen to be one-man bands, but the option is there if they need it. They have each proven their talent for wowing by recording albums entirely on their own.