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Would this be allowed?
According to the program policies, no.
Which part? I've read the TOS a couple of times.
Plus it sounds like you're going to be generating a popup from third-party sites, which IMO would also be a problem.
Hmm...understood...but if the click is to a "page" on my site (an HTML/browser-based audio player), then, technically, the ads are on my site via a click from another site (just like any of the ads on my actual "pages").
No AdWords ads or Google search box may be displayed on any domain parking websites, pop-ups, pop-unders, error, registration, or "thank you" pages, or in any email.
The Program Policies is a different document than the TOS (link is on the AdSense login page):
Right, but, it's only a popup insofar as it's not a full-sized window. That is, it's a media player window, not an ad, and one that comes up through direct user interaction, not just by visiting the page.
I guess this is a special case I'll have to ask the Adsense team about directly.