A really good song from David's 1978 Solo LP "North Winds" - the LP Whitesnake was formed to promote. I'm not too sure how well known this post Deep Purple era of his work is, it contains some excellent songs, well worth searching out.
No vocals or guitar, everything else is there, even the theremin - a - like in the middle section.
I've added an ending which I think fits - the album version fades.