Sure Flash or its little brother called SWISH [ http://www.swishzone.com ] will let you bring in a large 1mb wav file and when you "Publish" it creates a 10k .swf flash format file. Then place that .swf file just below the panorama viewer. The .swf audio file won't be a part of the panorama but the affect is the same.
Ours has an ON/OFF switch in the .swf so you can turn the audio ON or OFF if the music gets to be too much. Find the on/off button on the lower right corner of the page.