The only way I know of doing that would be to use a frameset or an iframe. I think in this case an iframe would be best. When your users go to the gallery, have it load a page with the music file playing on it. Also have an iframe on that page. Give that iframe like 98% width and 700px height, a name, and no border:
HTML Code:
<iframe name="gal_pages" src="1st_gal_page.htm" frameborder="0" width="98%" height="700px"><iframe>
Wherever you have a link within the gallery to another gallery page, use like:
HTML Code:
<a href="2nd_gal_page.htm" target="gal_pages">2nd Gallery Page</a>
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