Initial thoughts.... This has no value to me personally, as I just scan down the Versions tab list and go to the entries that may be of interest. Nevertheless, others have different needs, interests, and ways of doing things; therefore, what do I get from using these buttons that I don't get from the Versions tab? Used Teach Your Children as an example:
The list shows performing artist, date of release, and tags/other info. Also separately groups instrumentals and adaptions. For non-editors/CCs, the new info is the release title/cover art, recording dates/etc,, rating, and other comments. I would guess that the comments has the greatest potential for value added here, so perhaps some uniform comment language should be created and encouraged to better leverage this feature.
Bug? Clicking on Teach Your Children (the first listed performance) and then the back button takes me to Teach Your Children (the second listed performance). Back again takes me to Teach Your Children (currently the last listed English performance). Forwarding from there just reverses the same order.
Now coming from a release page, say The Great Blind Degree by Richie Havens (which has a cover of "Teach"). A user may expect that clicking the buttons will take them to the next performance on that release. Not sure if anything needs to be done about that, just an observation.