Where is Brian?
There are many persons named Brian.  Can you specify some more information, such as Brian's surname or other identifying information?
He plays guitar, curly hair, not from USA
You may be referring to Brian Harold May, who is an English musician known worldwide for being the lead guitarist of the rock band Queen. He also has curly hair, so it fits your description. As for his whereabouts, it seems he is currently living in south-east London, although this information may be inaccurate.