Understanding the context and influences of certain pieces of literature requires understanding the mythology of the culture it came out of. So I would think some questions about mythology should be relevant. On the other hand, this is not mythology.SE, so other questions (e.g., "What's the difference between Odin and Zeus?") should probably not.
Here are some ill-thought-out examples to start the discussion. Feel free to edit better examples into this question:
Where do the Sirens in the Odyssey come from?
How did the idea for the Sirens arise or evolve in Greek mythology?
In Greek mythology, do Sirens want to lure men to their deaths?