Jeffrey Gaines, the acclaimed singer-songwriter known for his soul-stirring rendition of “In Your Eyes,” brings raw emotion and acoustic brilliance to the stage. Sharing the bill is Josh Joplin, whose shows are high-energy, lyrically sharp, and unexpectedly heartfelt. Like an Armed Forces-era Elvis Costello with Woody Guthrie’s bent for banter between songs.  Joplin’s voice — both literal and lyrical — carries that rare mix of empathy and edge. He’s a storyteller with good instincts, and a pop craftsman with protest in his marrow.