His musical Heading East, with book and lyrics by Robert Lee, won the 2001 Richard Rodgers Development Award[1][2] and was restaged in New York in 2010 in the form of a concert presentation.
Ko won ten Best Score awards for his Cantonese musicals The Good Person of Szechwan (四川好人), The Legend of the White Snake (白蛇新傳), Field of Dreams (頂頭鎚), The Passage Beyond (一屋寶貝), Sing Out (奮青樂與路), The Woman in Kenzo (穿Kenzo的女人) and The Impossible Trial (大狀王) as well as his a cappella theatre piece Our Immortal Cantata (大殉情) in the 2003, 2006, 2009, 2010, 2012, 2017, 2018, 2022 and 2023 Hong Kong Drama Awards.
In 2006, he wrote a new opening song and incidental music for Princess Changping (帝女花) presented by Yam Kim Fai & Pak Suet Sin Charitable Foundation (任白慈善基金) and performed by Chor Fung Ming Troupe (雛鳳鳴劇團).
Later that year, he orchestrated and performed a medley of two songs[7] (one of which was tailor-made for the poem Looking up at the Starry Sky (仰望星空) written by the PRC Premier Wen Jiabao) at the Cultural Show in Celebration of the 60th Anniversary of the Founding of the People's Republic of China (香港同胞慶祝中華人民共和國成立六十週年文藝晚會) together with Jacky Cheung, Yao Jue and Yang Peiyi.
[10] In 2024, he curated another edition of the theatrical exhibition entitled Time in a Bottle (琉璃之歌), held in The Box at Freespace in the West Kowloon Cultural District and Ishikawa Ongakudo in Kanazawa, Japan.
This exhibition intertwines theatre, music, visual art, and scent to narrate the story of human existence, exploring themes of creation, prosperity, war, revival, and death through 12 theatrical scenes.