Secondary/special posts without creating a second blog

First off, I’d have to say WordPress is awesome and has a great support community!

I power my website ShadowvillePro.com with WordPress, using posts to represent a listing for a song/beat.

However, I would like to include written articles in the website, but I do not want them to interfere with the beat listings (such as falling into the post categories that are supposed to be ‘beat genres’).

For now, I am using ‘pages’ to do articles, as you can see on the sidebar on the homepage. However, this is highly inefficient because I can’t have another person post articles since it gives them ability to edit ALL pages. Also, I wish to display, say, the 5 most recent articles instead of having the pages listing to list ALL of them.

So my question is, is there a way (using hacks, or plugins, or any means) to create a second instance of posts and categories that do not mix in with the main posts on the website? Please keep in mind that I do not wish to install a second blog, as I want to use the same domain name, same user database, etc.

I appreciate any response on this matter.