I'm not sure if anyone has come accross this before, but you can actually listen to the whole of Lightbulb Type Ammonite here >> http://www.xiami.com/album/315664 All the songs are untitled and most of them are instrumental, but Spira Mirabilis Theatre is track 7 and Paleozoic Within the Body is track 9. The website seems to say that you can't download it without their app, but it's still really cool to hear, especially as we now have the lyrics!
I'm not even sure if there were even recordings of most of the other plays? I saw a casette of Kasper Hauser on a couple of Japanese auction sites, but the only track I've ever heard from it is ZUM.

Wow NICE!
I don't normally pirate Seazer music but I've only ever seen this cassette tape on Japanese auction sites with a starting price of 20,000 yen which is about 200 USD... money that wouldn't be going to Banyu Inryoku anyway... so I don't really have any qualms in this case.  ...Except that I don't know how.
Oh hey it actually lets you play the whole thing without downloading! Nice, ideal.
I think whoever made these lyrics pages must have had access to cassette tapes or something to transcribe them? But I don't know. Maybe there are lyrics included with Seazer's autobiography or something. Would like to buy that, but I'm definitely not ready for an entire Seazer book in Japanese at this point.
There are some Kaspar Hauser tracks on the Apocalypse CD, and the songs are all sorted by which play they came from, v. conveniently. There are probably other Seazer CDs that are like that, but... who knows... it was hard enough confirming this CD had a lyrics booklet before ordering it.
Since I have access to some of that information I can probably help figure out which of these tracks (Lightbulb Type Ammonite) are what... Well actually anyone could based on the site I linked to...