Why you should hire a copywriter.
Apparently Microsoft aren't 100% confident that 'Songsmith' is one of their more impressive products, so it's understandable that they didn't want to invest in marketing it. However, the developers of the product didn't agree, and so they thought, "Hey, let's just write the ad ourselves."
Do I develop computer software and release it, bugs and all, onto the world? No, I do not. So developers, stick to what you know. It's better for everyone that way.