1) Australian girl group 2) Coloraturas 3) Nightingales and wrens 4) Warblers 1) Bobolinks 2) Wrens 
Members of Suborder Passeri, which is one of the two large suborders of Order Passeriformes (perching birds); songbirds also are known as oscines or true songbirds. Songbirds have particularly complex voice boxes, which allow them to sing more complex songs than other birds.