I find that using more realistic content is a great help in web design and development since it's easier to understand and "feel" the final web experience. A site filled with Lorem Ipsum to me is like a portrait of a person where the pupils are missing, it's lifeless.

What I typically do is that when I work on a site about music, I'll just find some similar sites and take images and text from there that is a close match to what will eventually be used in the project. Especially for bigger projects and content-driven sites, where the client will later add the final stuff via their CMS, this works great (especially when you have otherwise only cat pictures and "this is a test" text that some dev added).

Seems like people have different experience, but I find using more realistic content a great help for everybody involved, since it simply makes the site more real and therefore it's easier to make it better.