Sorry to be the bearer of bad news, but they'd need a visa - you can try to get away with playing without one, but if you get caught you'll be deported and banned from the US for 10 years. And US Visas are HUGELY expensive and a paperwork nightmare these days (since 9/11 costs have soared). They will need someone in the US to file a petition on their behalf, and you need to provide proof that you are "notable in your field" to even get an interview at the embassy. Its pretty soul destroying. As I say - you can risk it, but it could go pretty wrong if they get caught. Good luck!
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