‘Repertories: Medieval’ studies Medieval musical styles. The Middle Ages marked the start of Western music history. Gregorian chants have been present throughout history, and there is no ‘correct’ way for a chant to be sung. Medieval notation recorded information on melody and performance, but not pitch or duration, and the symbols are still not fully understood. Uniform chant notation was not available until the seventeenth century, and there was a revival in the nineteenth century. Instrumental dance music was rarely written down. It is very difficult to be sure how Medieval music was performed. This is both a challenge to authenticity and an opportunity for expression.