A fiddler tunes. A woman on upright bass stretches her hands. The banjoist adjusts his strap while the mandolinist takes a drink. In this moment before a song, the possibilities of sound are only as limited as the experience and the vision of the artists onstage. From the lineup of instruments, you might expect a traditional bluegrass tune from such a group, but why not arrangements of Bach or a Rush cover or a surreal ballad in the style of David Bowie?