As for me, If there is a option to close it immediately and the music is soothing I don't think I would mind it.
I am planning to use some soothing and soft music on an indian restaurant site I am making.
Kill the music. If you don't I would strongly suggest making a button that super easy to find so visitor can turn it off right away.
Music can compliment a site, but way to often people get seriously annoyed by it. Think about your target audience, and where they would be accessing your site. Is is a lunch crowd, and corporate people are looking at it? If that were the case I would say no music for sure.
I generally have music playing, so I hate music n websites.
If there was no identifier that the link went to a PDF file, and a visitor clicks it, they expect their browser to handle this. Since it doesn't it's considered a hostile takeover of the computer. It can also be especially hostile if the computer was slow, or the file was large.
The same thing is occurring with the sound file, and those listening to music already are getting rudely interrupted.
Seriously dude, try and avoid the music.
My advice - Stay away from music. Often when I am searching the web at my day job and I com accross a site with music, I quickly close the page.
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As everyone says, stay away from it.