When I hear Meredith Wilder sing, her dulcet tones often trigger a Zen half-smile. Performing solo, vocalist and guitarist Wilder―known for work with folk-rock trio Wildewood―shares her serenity-inducing vox on Saturday, Jan. 11, at Low Spirits (2823 Second Street NW). Headlining Americana foursome The Saltine Ramblers aren’t straight-up homage; if titling their latest with a Back to the Future quote isn’t sufficient proof, see their eccentricity on both Ramblers’ originals and renditions of classic tunes. And The Squash Blossom Boys incorporate bluegrass, Cajun and old-time conventions, and they honed their improv skills in a variety of venues. Both bands join Wilder in hosting a 21-plus fête worthy of a haunting by Bill Monroe’s ghost. The people’s music sparks up at 9pm, and admission is $7.