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My recollection of the infant language learning experiments is that babies around 12 to 15 months (maybe less) can distinguish a full range of language sounds - they can't reproduce any of them reliably yet. Some time after that they become unable to distinguish sound that are not phonemic (create distinct meanings) in their cradle language(s). Then they become able to create speech. It seems it's a matter of not hearing (noticing) the sounds of foreign languages. I would say that if you can't hear it you can't say it.
Singers get training in hearing and reproducing the sounds of foreign languages. Our choir director has english as her fourth language, and doesn't see why we shouldn't sing songs in whatever language they were written in. Our last concert had nearly half a dozen languages; that can get confusing. Not that we understand what we are singing, but we do try to get the pronunciations right.
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