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Nowhere. It just does not exist. The closest we have to David Lynch's original vision is the theatrical release. Some people sometimes refer to the extended TV cut as the "director's cut" (and some even dare to offer copies of it in various auction sites under that label), but that couldn't be further removed from reality, as that version was rejected by Lynch to the point of deleting his name from the credits. A legal DVD of Dune: The Director's Cut exists, but that's for the 2000 Sci-Fi Channel miniseries, not this film.However, the cast and crew of Lynch's Dune have confirmed that Lynch showed them an 'assembly cut' of the film shortly after principal photography wrapped. Although the film had yet to go through post-production, the reaction was very positive. This cut has not been seen since (as is the case with most assembly cuts).
It's "Backyard" by Emmett Chapman, included on his album Parallel Galaxy. Chapman was also the creator of the instrument (known as the Chapman Stick) that Gurney plays, repainted and with an added lower part to represent the Baliset described by Frank Herbert in the original novel.
Herbert was very complimentary towards the film, impressed that Lynch had managed to include so much from his novel in such a short time. He did, however, take a small issue with the portrayal of Paul as having become a literal god-figure at the end.
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