The catalog number on the record label of the record at the end of the chapter looks like it mostly resembles "SXL 9256" but google searching that leads to a Discogs listing of the UK pressing of "Ludwig van Beethoven - Willi Boskovsky, Wiener Mozart Ensemble – Violin~Romanzen & Tänze" which does contain the Matrix number "ZAL 9256", which is not the catalog number but it's on a Decca record and was probably drawn that way for copyright purposes. Decca does still exist so that could be why. As for that song in particular, it looks like the cartridge is past the first set of grooves that would contain the first song and is playing the second song which is "Romance in F - dur, op. 50 für Violine und Orchester" by Beethoven according to the Discogs listing. That URL probably sounds different as to what's on the record however.