Another integral part of the early music sound-world is the musical temperament. Music in the middle-ages favours intervals of the fourth and fifth, which is why Pythagorean tuning was used. The interval of a third was used as a clash until the Renaissance, when it became consonant in compositions, which went hand-in-hand with the widespread use of meantone temperament. During the 17th century, Well temperament began to become more and more popular as the range of keys increased. Temperament affects the colour of a composition, and therefore modern performances, typically employing equal temperament, may not be true representations of the composers' intentions.