Yeah, bandwith is always something we gotta bare in mind when building a website but try lowering the bitrate of the mp3's you use, or just small bits that keep looping on and on, it usually works fine if you know how to pick the bit you want to loop.
I can give ya an example: Thievery Corporation - Warning Shots
That musica has a nice beggining you can use to loop, and it kind gives an ambience to the website, but of course, it may not be the best for the theme...
Overall the site looks and feels very nice, coherence is the key word, the site looks overall neat and sleek due to the lightweight graphics and the good combination of the few used colors. Congratulations.