Nicholas is regularly commissioned and some of his works have been premiered by the Royal Melbourne Philharmonic Orchestra and Choir, The Australian Voices, the Melbourne Chamber Orchestra, the Benaud Trio and Concordis Chamber Choir. He has also written for film and television, with some of his work being screened at festivals and theatres around Australia, Asia and the US. In 2007 he was nominated for "Best Original Song Composed for the Screen" in the APRA-AGSC Screen Music Awards, and in 2015 was a winning finalist of the NYU Film Scoring Competition.
He has been adjudicator of the Original Composition sections at the Dandenong Music and Arts Festival and the South Eastern Arts Festival, as well as Musical Director for Windmill Theatre Company, receiving both a Lyrebird and Music Theatre Guild nomination for Best Musical Director. Recent conducting engagements include concerts with Grammy-winning US trumpeter Chris Botti, Amanda Palmer of The Dresden Dolls fame, and the Australian national tour for singer-songwriter Ben Folds.
Nicholas has worked with Tina Arena on six Australian tours, writing new orchestral arrangements and conducting the Sydney, Queensland, Adelaide and West Australian symphony orchestras. He has also written arrangements for Missy Higgins, Passenger, Eskimo Joe and The Whitlams, as well as working on five seasons of The Voice Australia. His orchestral arrangements for the recent shows All You Need Is Love (The Beatles), Stairway To Heaven (Led Zeppelin), Nothing Has Changed...Remembering Bowie (David Bowie) and Praying For Time (George Michael) have been enjoyed by audiences around Australia.
In 2009 Nicholas was commissioned to write an hour-long cantata mass for the centenary of the death of Mary MacKillop, and 2008 saw the premiere of his Requiem Concordia, commissioned by Concordis Chamber Choir to mark their 10th-anniversary. After a string of infamous pop covers, his long-standing affiliation with the Benaud Trio culminated in a new commission, Trailer Music, which has been released on their debut album. This piece was recently the subject of a new film created by 6 emerging filmmakers in conjunction with contemporary music group anon., and was featured at TEDxFoggyBottom in Washington D.C.
He is currently completing work on a major theatrical work, TROT. Written with lyricist Gordon Lindsay, it is a new musical based on Charles Dickens’ much loved David Copperfield. He also recently completed a new ballet score, Kazka, for Lehenda Ukrainian Dance Company, which toured throughout Australia, Canada and the US.