I am having a problem with sharing/liking links with Open Graph Protocol data for audio/mp3 files. They look OK on Facebook news feed/timeline, but when you click play button, it won’t play. It says: undefined (see screenshot).

So I tried playing some older posts of links with OG meta data about audio/mp3 files, and they don’t play either.
EDIT
I did some firebug inspection and the audio player is Flash based. I think the problem is in the flashvars part of the embed code. There is a flashvar for src but its value appears to be a SHA256 checksum instead of the URL of the mp3 file.
It seems like Facebook have finally fixed it – at least, the audio players on my page have started working again. Hopefully that means you should see it fixed relatively soon, depending on how this is rolled out.