Grandpaboy is Paul Westerberg, singer/songwriter/guitarist and de facto leader of the revered (and now defunct) Replacements. Not exactly a secret venture, but a means for Westerberg to escape expectations and get back to playing devil-may-care, stripped-down rock. He plays all the instruments on each Grandpaboy release and, in keeping with the concept, uses various eccentric pseudonyms. Read more on Last.fm