Japanese Wikipedia article
Another website about the sirens
The same in Google translation
SOUND FILE (in wma format)
Translation of Wikipedia's article:
Searching thru Google images, I found some similar sirens:"Kojo no Tsuki" siren
During the reign of Marutsuki department store, 4 times per day at 10 am, noon, 15:00, 17:00 the melody "Kojo no Tsuki" can be heard from the siren on the roof (aka: Musical Siren). This was installed to commemorate the addition of a floor in October 1953. The siren sounded its first cry on December 11th. It was the first one to be installed in the Tohoku region due to the price (one million yen per unit) and the limit of having one per city. Due to its great volume, the siren can be heard not only in the central city of Sendai but also in the suburbs. Polyphonic music can be played form the sirens.
Also, sometimes in 9 pm, the store employees play the melodies "Kono Michi(This way)", and "Ieji(Road to home)" using the keyboard. It was requested by the police in the Miyagi Prefecture(where Sendai city is located)
However due to aging, pitch and other equipment were increasingly deteriorating. On July 15th, 1987 the siren broke down. Despite attempts to repair, the parts for this old machine proved too difficult to find and were not manufactured anymore, since then the sirens have been silent.
The beloved and well-known sound of Sendai would be lost forever.