There was a time (1950-70s) when cereal boxes had music records on them. Like the rest of the box, the records were made of thin cardboard and you'd have to to cut them from the box. The online Museum of Flexi/Cardboard/Oddity Records where I found this piece says that Wheaties were first to manufacture this multimedia packaging. You can also listen to the sound of this record.
On a related note, check out a McDonald's jingle printed on a cardboard record and given out at restaurants in late 80s.
Related post:
Video, Data on Vinyl Disks
