Sonorama was a monthly French audio magazine that debuted in 1958. Following the format of Echo magazine as featured last week, it folded back so that the pages could be placed on the turntable and the discs played from there. The design may not have been up to the standard of Echo but it ran for considerably longer, reaching over 40 issues with usually with between 5 and 8 flexi discs in each publication.
The plain white, extremely thin discs in my copy of No.6 (they should be floppy discs, rather than flexi) contained nothing but a number on each. There’s a short film at the bottom of an issue being played, not the one featured here though, where you can see the construction of the mag and hear an example of the disc (he has a job to get it on the turntable at one point). There seem to be many of these available through Discogs for between €4-10 each.