Last night I was reminded of my fruitless search (back in 2002, I think) for the Tetrisphere soundtrack. Tetrisphere was (and still remains) one of my favorite games of all time. It was released for the N64. Sound for the game was done by this guy Neil D. Voss, I learned at the time, but Nintendo never actually released an official sountrack, even though the game won a “best soundtrack” award from Nintendo Power. Conspicuously the wikipedia link above doesn’t really say what Voss has been up to since then.
Also interesting is this IGN interview with Voss on the making of the Tetrisphere soundtrack (via wikipedia).