There is a soundcloud tag already with 26 usages. There should be a bandcamp tag. It's a very similar website in purpose. Both have their own special features but they're both fundamentally made for music producers to share their songs.
By the way, I think this site should consider lowering the reputation requirement to create new tags. The reason is that the world of web applications is very rapidly changing. New tools pop up all the time, and there are enumerable sites that could feasibly discussed here but that nobody's added as a tag. If the reputation requirement were lower, then people would have an easier time posting their questions here since they don't have to limit themselves to the existing tags. If more people posted, the site would become more useful as a general-purpose webapps Q&A site.