Steven Tyler unexpectedly cancelled several South American tour dates. USA Today reports the cancellation was for "unspecified health issues." Tyler declined to give details, but says it's not a life threatening issue. While on hiatus from Aerosmith, the former American Idol judge tried his hand at country music.  Tyler flew back to the US after a Monday night show in Sao Palo Brazil. He issued s following statement, apologizing to the people in Brazil, Chile, Argentina and Mexico. A representative also issued a statement, saying Tyler is expected to make a full recovery.