In 1973, Grace Slick recorded her first solo album, a soundtrack to the movie Manhole. Unfortunately, the movie itself was never made, but the resulting soundtrack was released on its own. Not surprisingly, the album wasn't particularly successful, and it was soon forgotten. God only knows what this movie was actually going to be about (I'd appreciate it if anyone could shed some light on this).
That being said, the music for this soundtrack ended up being completely brilliant, and deserves another listen. That's where Retrospace comes in. Here's the 12 minute title track for a movie that never was...
"Theme from The Movie Manhole" by Grace Slick
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I can't help but wonder if there were any other soundtracks created for movies that never were. I know Pete Townsend had conceived of a movie called Lifehouse, and wrote a number of tracks for it, but it never materialized. I used to think Pink Floyd's Obscured by Clouds fell into this category, but it turns out its corresponding movie La Vallée was actually released.
The Elder (by Kiss) always struck me as a soundtrack rather than just a concept album, but my understanding is that it was recorded as something more akin to Floyd's The Wall rather than a movie soundtrack. At any rate, I can't think of any other examples of soundtracks for nonesistent movies (a quick Google search proved fruitless). I'd be interested to learn of other examples.

