Hi, I saw that on one of the Music lists there was a link posted to a French Radio program that discusses the dulce melos .
<http://sites.radiofrance.fr/francemusique/em/matin-musiciens_lundi/emission.php?e_id=65000042&d_id=515007905&nojpcache=true>
it seems that there is also a youtube recording.
<http://youtu.be/N9rkLtsxwuc>
regards Peter B