Hartono won the 2005 Teenage Icon singing competition, and has since performed at the Mosaic Music Festival and at the Singaporean National Day Parade.
Nathan Bedford Forrest | Nathan Lane | Nathan Hale | Nathan Milstein | Starboy Nathan | Nathan | Nathan Fillion | Nathan the Wise | Nathan Englander | Nathan's Famous | Nathan Mayer Rothschild | Nathan East | Nathan Appleton | Lionel Nathan de Rothschild | Nathan Scott | Nathan Phillips Square | Nathan Phillips | Nathan Lawr | Nathan Carter | Nathan Barley | John Nathan-Turner | William Nathan Wrighte Hewett | Rudy Hartono | Nathan Zuckerman | Nathan Stoltzfus | Nathan Rennie | Nathan (prophet) | Nathan Parseghian | Nathan Mumm | Nathan McCullum |
Local celebrities who participated in the concerts included Dick Lee, Shiek Haikel, Azrina Ahmad, Koh Chieng Mun, Mark Lee, Sharon Ismail, Jai, Nathan Hartono and Project Superstar Season 1 winners, Chen Wei Lian and Kelly Poon.