My point is: don't go asking a lab if there's no possibility that you'll use their services. The exception to that is when it's a lab's responsibility to give advice - in Europe for instance, if you need a concise answer on exactly which tests apply to your product, you can hire an NB (Notified Body) to interpret the regulations for you.
At my lab, I was happy to give advice for existing customers or if I had a shot at securing a new client. I drew the line at providing advice to customers that were using labs in China but asked for free support here because of the language barrier.
Option 2 - Check your competitor's datasheet
If any of your competitors claim compliance for the same target markets as you're aiming for, they often cite the standards that they've tested to in their product datasheets. Search Google for identical products and look for the compliance and regulations section of their datasheet. Very often you'll find the answer you're looking for.
For example, search terms like "Audio power amplifier +'declaration of conformity'" are useful for Europe, or "Audio power amplifier +'FCC test report'" for the US. They'll usually turn up some good candidates. This will also usually turn up the right safety standards too!
Option 3 - Find them yourself
Manually tracking down the EMC standards is no easy task. It varies between geographic region and product type. Read on below to find links to several to the EMC standards of several countries and industries.