Greg Brown's rich baritone has enough ballast to rival that of Waylon Jennings. He's purveyed peripatetic folk, country and blues for four decades and released nearly 30 albums. His music travels easily from slow, meditative tunes as inexorable as the tides to backwoods blues-funk and gently burbling folk shadowed by pathos. His voice's rumble and the typically downbeat tone dovetail in a mournful amble. Last year's Hymns to What's Left was an album-long elegy that found Brown summarizing his approach with solemnity: "I'm creaking and moaning like an old tree limb."