Their previous program “Lost & Found III” tasted like more, and so Tim Knol and the award-winning Blue Grass Boogiemen return to the theater. The five friends challenge each other with their virtuoso string playing, where the fun splashes off the stage. Also appearing for this theater tour is a new collaborative album, the follow-up to the acclaimed “Happy Hour. In the theater concert the musicians dig further into the rich history of bluegrass and country music and show their fine nose for the frayed edges of the genre, the domain of acts like Townes Van Zandt, The Stanley Brothers and Flatt and Scruggs. In “Tim Knol & Blue Grass Boogiemen Ride Again,” you will hear songs from the new album, as well as music and anecdotes from their heroes.