With ice caps melting and folkloric Mumford pop on the rise, volume two of this maritime music project – produced partly by pirate-booster Johnny Depp and fantasy-band builder Hal Willner – is even more timely than the first. The mood varies wildly: Beth Orton incants lonely blues (“River Come Down”), Iggy Pop fends off butt bandits (“Asshole Rules the Navy”), Frank Zappa gets jazzy (a late-Sixties “Handsome Cabin Boy”). Michael Stipe sounds great with pal Courtney Love on “Rio Grande,” and Tom Waits wrings boozy pathos from “Shenandoah,” which features Keith Richards on guitar. Yes, there are duds among these 36 tracks. But they pass the time. Boat trips can be really fucking long.