Are song lyrics and poetry on topic or off? Poetry seems like a shoo-in, but song lyrics could be a problem if the question veers into music.
On-topic if the question about song lyrics is a literary question - in other words questions about imagery, rhyming, rhythm (for the lyrics themselves), and word choice seem like they should be allowed.
Off-topic or at least a gray area if the question is primarily musical - matching lyrics to a tune, for example.
Well, frankly, this is more in line with what I'd be more interested in seeing.
Posting a few lines and asking for editing or phrasing advice is more appealing to me than answering questions about word processing software.