I think atleast 10 out of the 73 song segments have leaked and are available in full. But billy has stated that each and every segment of the pastichio medley is indeed part of a full length song, most of which are just instrumental jams or ideas that have been scrapped and may never see the light of day. i think this is some of his best work imo and its such a waste of time and effort if he never releases them
"The Groover" (3:21 - 4:03) has been my favorite ever since I first heard it. I still listen to it in awe.  It should have been a completed and released song! It would have been incredible on Mellon Collie.