Nobody expected Lily & Madeleine's first original song, "In the Middle," to rack up a quarter of a million YouTube views. Their songs are the product of two distinct musical personalities. Madeleine, the older sister with a light, smooth singing style, leans towards folkier, singer-songwriter fare; Lily helps lean the duo towards its gentle rock edge, and has a dark, earthy voice to match. But their voices blend into seamless close harmonies, created with the natural ease that could only come from a pair of musicians who have known each other their entire lives.