If you haven’t heard Leona Lewis, you should spend some time listening. Apr 4 2008 8:00AGood Morning America (ABC) New York, New YorkApr 8 2008 8:00ALive with Regis and Kelly (ABC) New York, New YorkApr 11 2008 8:00PJimmy Kimmel Live (ABC) New York, New YorkApr…