What happens when you put six astonishing guitar virtuosos from four different countries on stage at the same time? You get the California Guitar Trio and Montreal Guitar Trio. Expect this “phenomsemble” to explore dazzling new arrangements of classical, jazz, progressive rock and world music — as well as intricate original compositions you have to hear to believe. It promises to be a night of eclectic, energetic music from six of the world’s top guitarists.