Coming up on its twentieth year, Capercaillie ("capper-KAY-lee" a kind of grouse) has constantly evolved, and its members have challenged each other with new sounds and innovative arrangements. The group started out with traditional material; Matheson, a native Gaelic speaker who would still rather sing in Gaelic than in English, grew up in a small town in the Outer Hebrides where pub musicians on Saturday night were the main source of entertainment. Gradually, though, they grew dissatisfied with what their liner notes call "kilt culture" and began to modernize their sound.
Synthesizers, electronic percussion, digital samplers, and even occasional hip-hop-style scratching made their appearance (in concert all neatly boiled down to a keyboard), and Matheson kept pace with them every step of the way. Capercaillie does a traditional number called "The Tree," in which she artfully weaves the song's nonsense refrain into a background of mostly electronic sounds. Vocal purity is only one arrow in her quiver, and the range of music the group makes as a whole is wide. Capercaillie does contemporary songs of romance and social comment, and the group has worked with West African musicians in fusion pieces for which the homogenizing term worldbeat doesn't seem precise enough.