Please note that the presence or absence of music on the site won't affect the review, and your reasons for having the music are your business, not ours. The editor might like your choice of music or not, s/he might hear it or not - unless it causes a browser crash or something the music shouldn't make any difference in either direction. It's also extremely unlikely that the reviewing editor will have seen this thread.
Music on a site might very well cause the review to be delayed if the editor opens the site and decides not to review it at that time, because of the music. But that's a different matter.