Boulder, Colorado's the Wood Brothers have been quietly amassing a rich discography of quality blues, folk, soul, R&B, gospel, and country-rock originals since their 2006 debut. One Drop of Truth marks their sixth trip to the studio, and while it doesn't deviate much from the formula -- a bit of Bob Dylan, a jigger of John Prine, a drop or two of Muddy Waters, and a whole lot of the Band -- it's easily their most laid-back and lived-in sounding collection to date. Opening with a post-hurricane blues lament that's more fun than it should be, the ten-track set touches on nearly every sonic and stylistic roots rock proclivity, from breezy funk ("Happiness Jones") to mellow, harmony-rich retro-pop ("Seasick Emotions"). That's not to say that it doesn't find time to shimmy and shake -- the swampy "Sky High" and the Big Pink-worthy "This Is It" are sure to become live staples -- but Chris and Oliver Wood, along with jack-of-all-trades Jano Rix, have settled into the kind of easy groove that can only stem from spending the last decade or so enduring the myriad inside jokes and stale air of life on the road.