Caveat - this answer is about possible theoretical usage of history tag, NOT about any questions that may or may not be currently covered by it today.
In my opinion, history is a valid separate tag for very specific usage - that is, questions about music as it applies to/affects overall history (as opposed to history of music itself).
Example: questions like "
effect of XYZ songs on morale of troops in WWII".
Litmus test is that usually, such questions might be on-topic on History.SE, but would be likely a better fit here, either because there are likely to be more topic experts on this site; or because they are insufficiently academically rigorous for History.SE's academic taste.