The term “Celtic music” encompasses Irish traditional music and traditional music of Scotland and the Shetland Islands; and other regions in the Northern Atlantic. Common characteristic musical forms include jigs, reels, hornpipes, polkas, and slow airs. Much of the music is typified by strong, repeating melodies in a set rhythm, which reflects a background as music to dance to. Ballads are also common. Celtic music employs a wide range of instruments, but the violin and flute form the backbone of most Celtic music. Bagpipes are the primary national instrument of Scotland and Irish bagpipes are called Uilleann pipes and are smaller and quieter than their Scottish counterparts. Other Irish instruments include the bodhran which is a frame drum held by a cross bar and played with a tipper, which is a small double ended stick and the harp and tin whistle which are also very prevalent in Scottish music.