Ruckus with Emi Ferguson (baroque flute) (April 25) Ruckus’s core members form the Baroque equivalent of a rhythm section: guitars, keyboards, cello, bassoon and bass. This “continuo band” has earned widespread critical acclaim for a fresh, visceral approach to early music that aims to fuse its questing, creative spirit with the grit, groove and jangle of American Roots music, giving the ensemble a unique “rough-edged intensity” (New Yorker). Flutist Emi Ferguson, a frequent collaborator called “wonderful” by the New York Times and “irresistibly vital” by the Portland Press Herald, joins the ensemble for some of Bach’s most playful and transcendent works.