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Are questions about analyzing a composition allowed?

Consider a piece of music that one is trying to analyze (let's say chord progressions), but he is struggling with doing so. He can tell _that_ the section works, but he can't tell _how_.

Would a question to the effect of "can someone help me analyze the music theory behind this section of this song" be on-topic?

Does this need to be a composition that's "out there," so to speak, or would even original compositions be allowed under this rubric?