An Evening With Mapache, Tim Hill Roscoe is a road dog. The 14-year-old Boston Terrier has been there for the whole ride of Mapache, Clay Finch and Sam Blasucci’s band, which has grown from being the casual project of two longtime buds to one of the most formidable cosmic-folk acts around. “Roscoe’s been through a lot of shit,” says Blasucci, the dog’s formal owner. “He’s been all around the country, come on tour a little bit.” With some bemused pride, Finch points out that, for a few years, he...