Mountain Home Music Company recording artist Darren Nicholsonis on a roll. Since his departure late last year from Balsam Range, the award-winning quintet he helped to found some 15 years ago, the singer, songwriter and mandolinist has revved up his solo career with a crowded personal appearance calendar, 3 singles that triangulate the corners of the bluegrass songbook — a chart-topping murder ballad, a spirited gospel number and a gripping instrumental, all self-penned — and now, the announcement of a new collection, Wanderer, that puts an exclamation point on his musical declaration of independence.