So if a corporation keeps this theme for years and years, and the person who wrote it acquires commission for it, that's a small, tiny income. What's neat about that is, you write another piece and sell it for commission, and that income is now on top of the previous income.
It's "passive" income, as opposed to "active" income. I do something, and keep acquiring money, and it's amazing how many different types of passive income there are. Just because most people have a 9-5 work job doesn't mean it's the best way of making money.
So my challenge to you is to find what you enjoy doing, and try to figure out how to make it passive income! Such as writing commercial jingles. :P
Have a musical day!