Designwise, the site is pants. Very bland and boring, and I'm not sure what the black pattern is supposed to be? Space/stars or static?
Your navigation links do not seem to change any of the content, and the about link is broken.
I'm aware its under construction, but shouldn't it be under a test area or domain if you are still working on it, rather than slapping it right at the front of your domain?
Code wise, great. You haven't used tables for the layout, which is nice to see. You're using HTML 4.01 Strict, which tentatively validates. But you don't have any character encoding? Put a character decleration on and your pages will validate properly. Is there any reason why you're not using XHTML? if this site has been built from scratch, you should have used XHTML in my opinion.
I haven't picked it apart too much, as I know you're learning, but if I was you I'd also make your site navigation into an unordered list, and then style that accordingly.
Code:
<div id="navbar">
<ul id="navigation">
<li><a href="index.php">Homepage</a></li>
<li><a href="about.php">About</a></li>
<li><a href="music.php">Music</a></li>
<li><a href="video.php">Video</a></li>
<li><a href="reviews.php">Reviews</a></li>
<li><a href="tabs.php">Tablature</a></li>
<li><a href="contact.php">Contact</a></li>
</ul>
</div>