[9] In 2004, at the beginning of his career, Harder played the lead role as 'Simba' in the Australian stage production of The Lion King.
[14] Harder was the main support slot on Teddy Riley's Blackstreet arena tour of Australia & New Zealand in 2009.
Harder has also been a headline performer for New Zealand's Coca-Cola Christmas in the Park concerts in Christchurch and Auckland.
[19] In 2012 he wrote and produced the number one hit song, "Come On Home" for New Zealand boy band sensation, Titanium.
[23] On 18 October 2019 he performed halfway through the first day of the Downer Nines Rugby League World Cup in Australian city Parramatta.
[24] In 2021, Harder was a panelist for the reboot of the 1990s New Zealand music reality TV show, Popstars.