This is sure to be a night of many different moods. There’s Malcolm Holcombe’s gruff, down-home finger-style folk blues, which took a scruffy and spare country turn on last year’s album To Drink the Rain. Holcombe leaves no rock unturned when he digs around for images to ground his gritty lyrics. Kathy Mattea is the only one in this bunch who’s ever ascended the steep mountain of bona fide country stardom, but that was in another lifetime. She’s made her second Appalachian folk album in a row, relishing pastoral scenes, lamenting industrial destruction and bringing her rich, ballad-honed interpretive skills to rawboned songs from writers like Jean Ritchie. The Jonathan Scales Fourchestra, on the other hand, indulges in complex, jazzy improvisation, led by Scales, a nimble virtuoso who plays pretty much the last instrument you’d expect: Caribbean steel pan. Eaten by Dinosaurs — a new collaboration between guitarist Gibb Droll and ex-Wilco drummer Ken Coomer — is something of a wild card, but Coomer will probably also be part of the backing band for spiritually inflected alt-country singer-songwriter John Francis.