With its 10th album, "Anchor Tattoo," the Alabama-based husband-and-wife duo Martha's Trouble continues to intensify the mystery as to why it remains a hidden gem. Jen Slocumb's sweet voice and guitarist Rob Slocumb's gentle strumming, which, along with just enough keyboard accompaniment to create a polished pop sound, evoke comparisons to 10,000 Maniacs' best work. Ultimately, the pair's uncommon talent for contagious hooks is the set's star, highlighted by the uptempo and melodic "I Saw ...