Very nice find for the only known recording of this siren. That song is home on the range if anyone was wondering.
Uwajima Castle Notes
There is a possibility that the gen 1 siren at Uwajima Castle played Tonbi as it has been previously demonstrated that Tonbi can be played with 10 notes. Uwajima Sansa and Railway Whistle need some tweaking to get them to fit in 10 notes. With a 12 note siren though, this is completely possible. This could also be completely false because no recordings of this siren exist and all my experimentation is using the key of F Major with a range of D5 to A6 and for the 10 note version E5 to G6.
the Wikipedia article gives a different list of songs, The songs are as follows: Shoes Ring 6:00 AM Walking song 12:00 PM, Home Sweet Home 6:00 PM, Hymn 405 10:00 PM. Although it is listed as Uwajima Castle, these are the songs played by the city hall music siren. The songs were apparently changed in 1970 to 6:00 Annie Laurie, 12:00 Shoes Ring, 6:00 Hometown sky, 10:00 Home Sweet Home. Because I don't know when the city hall siren was removed, I cannot say weather the second set of songs is from the castle or the city hall. This selection was replaced with the current schedule in 1991
For now I will assume that the Castle siren played the same selection as the current castle music siren and the wikipedia article put info on the wrong siren.
Notes on the Okayama Gen 1 siren.
In the Japanese Wikipedia article on music sirens, if you scroll to manufacturing, you will find a whole section on the two sirens on the Okayama Prefecture building. It says that the gen 1 siren played ""Morning" at 7:00, "Bodhi Tree" at 12:00, "Ieji" at 17:00 , and 21:00 . It played the traditional Japanese song "Lullaby", " Firefly Light " at midnight at the end of the year, and " Kimigayo " at 7 am on New Year's Day." It goes on to say that the songs from the first generation siren were inherited by the second generation siren. It also doesn't have the same functionality as the siren at Tokiwa Because the Okayama siren is a 12 note siren and Tokiwa's is a 10 note siren.
I think we have our second 24 note siren

- Screenshot 2023-08-28 7.40.12 PM.png (1018.82 KiB) Viewed 40045 times
at Takeda Pharmaceuticals I noticed an oddity with their siren. If you look on the corner of the building, you can see a now removed Yamaha music siren. The thing that makes me think this is the24 note variant is that the "Cage" or grille with vents to allow the sound to escape is much taller than a normal music siren. It also looks like it was stacked on top of a second music siren similar to Hamamatsu. Here are some close up pictures to compare to.

- Takeda Pharmaceuticals
- Screenshot 2023-08-28 7.40.30 PM.png (9.92 KiB) Viewed 40045 times

- Hamamatsu
- Screenshot 2023-08-28 7.51.19 PM.png (46.18 KiB) Viewed 40045 times

- Yawatahama siren for reference
- hqdefault.jpg (27.62 KiB) Viewed 40045 times
Wikipedia
https://ja.wikipedia.org/wiki/%E3%83%9F ... C%E3%83%B3
Where the images of the Takeda Pharmaceuticals siren came from:
https://sites.google.com/view/yamaha-mu ... oku-region
Sorry if you already knew this