Aside from his own projects, Duncan has become a popular sideman for a wide variety of artists such as ; Dianna Krall, Mark Murphy, Lester Bowie, Kenny Wheeler, John Hicks, Peter Appleyard, Sam Noto, Ed Bickert, D.D. Jackson, Scott Hamilton, Warren Vache, Sam Rivers, and arrangers Robert Farnon and Ralph Carmichael to name but a few. He was the bassist in the famed Rob McConnell and the Boss Brass for several tours including Brazil and concerts including Carnegie Hall.
Duncan has toured extensively throughout Canada, Great Britain, Europe, Brazil and the United States. He can be heard on over forty albums, numerous CBC, BBC and NPR recordings with such groups as The Pat LaBarbera Trio/Quartet, Dianna Krall, Peter Appleyard, Robert Farnon, The Warren Vache Quartet and the The Nikki Iles Trio. He is a reviewer and author for Double Bassist Magasine in the U.K.
The upcoming year will see a four part tutor series from Duncan entitled "How to Practise." He has won several awards including the Jazz Du Prix in 1999 from the Montreal Jazz Festival and has been nominated for the Juno’s (Secret), the Durham Music Society’s awards (Snapshots) and was nominated in 2006 for bassist of the year from the National Jazz Awards. Duncan is a visiting professor at The Royal Academy of Music in London.