I'm no artist, but I made my own Dashboard design. Adds should be left for the store,...

I should start my own company called AE (Artistic Entertainment) and start publishing games properly.

Those are songs form the Rock Band Network, where artists, whether known or obscure, can chart their own song or have somebody else chart it for them. Rock Band Network songs aren't able to be sampled from the Rock Band store that you download from the
dashboard though. You have to put in the Rock Band 3 disc and check its store instead. Kinda sucks, but it'll only take a minute or so to get past all of the "Made by..." stuff

Go through the in-game menu. That's where I found it and downloaded the trial.

As a graphic artist it kills me not being able to design my own skins but I have to admit the quality keeps getting better and better. They even have the two robots from Portal2.

I respect those artist too, thats why I got into making my own. One of the more well known artists when Forza 3 released had a tutorial of how to effectively make your own, and thats where I got my start. Mind you I'm nowhere near as good as half of them
on the storefront.

This is a solid question. I think the only way you'd be able to find who made any of the old stuff would just be by simply googling it as hard as you can. I know the new avatar outfits have the company/artist that made them credited in the top corner or
in the description... but it never dawned on me that wasn't in the 360 marketplace, unless it was and I'm blind. I'm kind of curious now too because there were a few old designs I also liked.