Jacob Sharp (mandolin and vocals) and Joseph Terrell (guitar and vocals) first teamed up musically while students at UNC-Chapel Hill. Wanting to form a band focusing on bluegrass and Appalachian folk, they added Wood Robinson (bass and vocals), and two became three. With their sound still evolving, a couple of years ago, Mipso (above, performing “Coming Down the Mountain” for 89.3 FM the Current) blossomed from a trio into a quartet with the addition of Libby Rodenbough (fiddle and vocals). Their fourth LP, Coming Down the Mountain (stream it below), was released just a few weeks ago. Roots-music journal No Depression says it’s “an album of 10 tunes that explore that tender spot just past the midpoint of your 20s, where the band now resides, when you’re taking stock of the past while looking to the future. Just as in that stage of life, the album exudes a sense of wistfulness among moments of joy, a few worries amid youthful confidence. Some regrets mingle with a wide-open view of the future.” Now touring behind their new material, Mipso play Music Hall of Williamsburg on Wednesday night, and the like-minded 10 String Symphony open the show.