By Brandy McDonnell Features Writer bmcdonnell@oklahoman.com The Oklahoma City Philharmonic will have to wait a little longer to say a proper goodbye to its retiring Maestro Joel Levine. The arts organization announced Thursday that it is postponing Levine's May 12 farewell concert as he battles cancer. The orchestra's founding musical director, Levine was diagnosed last fall with early-stage cancer.Read more on NewsOK.com