The piratesinfo articles probably do need updating a bit, but there are some posters on the piratesinfo forum who really know what they are talking about. I don't believe there are any traditional songs about Bonny and Read, in fact the only really period info we get of them other than court records is from the book "the General History of the most Notorious Pirates" written by Captain Charles Johnson, about 20 years after their death. This book is still in print, although some editions are credited to Daniel Defoe, as Johnson was thought to be a psuedonym of his for a time, an idea which is now widely discredited.

But yeah, no trad songs, although a few modern ones are about.