Is it possible to edit tags with cmus?
Is it at all possible to edit tags for .ogg files with cmus?
No but - quoting from the feature list - [it] Can run external commands for the currently selected files (tag-editor for example).
You can bind for example:
bind common ^E run your-tag-editor {}
So when you press Ctrl + e in the common context, cmus will open your-tag-editor expanding {} to the currently selected files.