The Sea of Song is mostly fairly warm, though it's much cooler up at the northern end. Anything having to do with the sea is a huge business on there, with song pearls being the biggest business. But by far trading is the thing that comes to mind when people talk about the Sea of Song. For about a day's ride (about 30 miles) around the Sea of Song is a free trade zone that has no controlling nobles in it. Towns and cities around the Sea of Song are run by councils and mayors, with Albon, the largest trade city in Low'verok, arbitrating all disputes with its Council of Mayors.
If someone considers themself a "self-made man," they were probably born around the Sea of Song. In addition to trade, fishing, farming (due to the warmer weather they have better growing conditions around the Sea of Song), and artistry are the biggest industries around the Sea of Song.