By Brandy McDonnellMIDWEST CITY - Australian guitar virtuoso Tommy Emmanuel is postponing his concert planned for tonight at the Hudiburg Chevrolet Center at Rose State College.He is having a health issue that requires medical attention and rest, according to the Civic Center Foundation.Tickets already purchased for the show will be honored for the new performance date on April 15."Tommy would like to thank his fans for the love and understanding, and he is truly sorry for any inconvenience.Read more on NewsOK.com