Hey, Mystery train. A nice pursuit!
Of course the obvious official releases are a must, with or without Nico & John Cale. A number of new acetates and boots have surfaced and been officially released too.
Try this for starters....free d/l (flac)
The Great Lost Velvet Underground Album--unreleased
http://rockanthology69.blogspot.com/200 ... album.html
(add the "tt" back into the http d/l link and you'll have it)
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The Grateful Breed blog is also an excellent
source for rare and live material.
http://gratefulbreed.blogspot.com/2011/ ... x-vol.html
"After silence, that which comes nearest to expressing the inexpressible is music".
-Aldous Huxley