I put music on the websites I designed... awesome MIDI files back in 1998. Around that time, the convention in web design became "don't include music just because you can. Your audience is forced to listen to it, and they should be allowed to peruse the website at their leisure."
Given that, WHY FOR THE LOVE OF GOD do 99% of wedding photographers put horrible sappy "mood" music on their portfolios? I have my own music, or I might be at work. See the above reasoning for why the music on your website, if you choose to include it, should be on pause by default with the option to play. Web designers who create these horrendous Flash monstrosities for photographers: what are you doing? Have you ever opened the sites for eight photographers in tabs and then after a moment of aural assault had your (awesome) computer seize up and die under the weight of so much Flash??
Whatever your reasoning, stop, please.