Katelijne Van Laethem was mainly active in the field of early music for quite a few years, with a repertoire from the 12th to the 17th century. As a soloist she is much in demand, collaborating with renowned musicians such as Paul Van Nevel, Erik Van Nevel, Philippe Malfeyt, Jean Tubéry, Paul Dombrecht, and Konrad Junghänel. Lately she has been applying herself increasingly to more modern music by, among others, Ralph Vaughan Williams, Edward Elgar, Johannes Brahms, and contemporary composers. She premiered several works by Dick Van der Harst. However, this does not imply that her love of early music has decreased. In 2008 her solo CD with songs by Hildegard Von Bingen appeared.