“It just does really have a lot of different worlds,” says violinist Colin Jacobsen about Layla and Majnun, the sui generis work which he’ll accompany, as part of the Silk Road Ensemble, at Zellerbach Hall at the end of the month. And he’s referring to different kinds of worlds. And it's their first full-length, choreographed and costumed collaboration, with the Mark Morris Dance Group providing motion and color.