We decided early on that song identification questions would be off-topic and shortly thereafter broadened to most types of simple identification questions. There are a couple reasons for this:
The asker doesn't really learn much. Rather than asking for scale identification for every new scale they run into, they should ask how to identify scales and then they can do the identification themselves! SE as a network is essentially for building and sharing expertise; simple identification questions don't do that.
They usually are Too Localized because they are only useful to the asker. In the case of text they are completely unsearchable and they also often consist of images or links instead. And it's unlikely that someone who stumbles across the post will have the same question. Questions that are unlikely to be useful to others are closed in line with the goal above — we want to be a repository of expert knowledge that is helpful to readers.
I think this was mostly discussed in chat or in comments, unfortunately, but there is another Meta post touching on my first bullet above.