Les chanteurs américains -- Oui ou non?

In June, I spied these two chanteurs who had gathered quite a crowd, or should I say young groupies, on a Friday afternoon on Rue St. Antoine. What do you think? Are they French, American, or are you willing to go out on a limb and tell me another nationality? How can you tell?

I'll give you a hint, they were singing tunes from the 60s.

I'm off on an adventure with Nanette to find some castanets -- I will still be posting daily but with fewer comments until I return.