Dion began singing with the Newtington College chapel Choir when he was 8 years old. In 2003 he sang the 'Pie Jesu' in a short film "Blessed". Dion was the only child soloist for Radio 702 ABC Christmas Stars 2003 CD with his performance of "Once in Royal David's City".
In 2005 he joined the children's chorus with Opera Australia's "Tosca". Dion performed a hauntingly beautiful solo at the ANZAC International Military Tattoo in Sydney 2006 accompanied by a 200 voice choir and 400 musicians including the Band of the Grenadier Guards, Her Majesty's Royal Marines, the New Zealand Army Band and the Tongan Royal Corps of Musicians. He sang with Opera Australia's Children's Chorus children's for "Hansel & Gretel", "Magic Flute", "Tosca" and had a principal role in "Batavia.
Dion has performed in various concerts including the MLC School African Sanctus, Newington College's Musical "Guys & Dolls" and with the Sydney Welsh Choir. He has performed for weddings, church services and functions. Dion has also performed voice overs for television commercials (singing) His CD Purely Dion was available through ABC Shops in Australia