John Mayer was out on tour in Europe and just performed in Copenhagen on Sunday but had to cancel his show for last Monday night. He has also cancelled all remaining shows this week in Europe which were all sold out, he will not be rescheduling and told ticket holders to get a refund. On his website he said he will be returning to the US to recover with doctors care. He said he is still planning on performing in Charlotte North Carolina on July 16.
What John didn't say is what was causing this illness, if I hear any details I will pass them along, or if you hear of anything- email me what you know.