How to use this material

Previously, a link to a PDF text of this project was provided on the site. Visitors to the site were advised to download the PDF and use it as an accompanying  text while playing  the recordings provided by the site for the examples cited in the text. However, the PDF is no longer available as a final revision of the whole text is now underway. It is hoped that this work will be completed by the end of 2019 or early in 2020. A PDF of text will then be made available.