In traditional Scottish music, the waltz was taught by travelling dancing masters to those who could afford their lessons during the 19th century. By the end of that century, the dance spread to the middle and lower classes of Celtic society and traditional triple-tune tunes and songs were altered to fit the waltz rhythm. During the 20th century, the waltz found a distinctively Scottish playing style in the hands of CĂ©ilidh musicians at dances.