Crown Copyright will no longer arise in respect of works made by servants of the Commonwealth of Canada in performance of their duties since Canada ceased to be a colony.

Whether any equivalent Canadian copyright subsists will need to be addressed under Canadian Copyright law.

God only knows what the position will be in the USA.

For works made while Canada was a colony and before the commencement of the UK 1988 act, most Crown copyrights are 50 years from making or publishing.

UK Crown Copyright may subsist in a work made by Her Majesty of by an officer or servant ofthe Crown in the course of his duties. Under the 1956 Act the provision was wider and extended to works made or publshed under the control or direction of the Crown.

This is starting to look as if we need a lot more facts. Why would they have been crown copyright in the first place? The musical and literary works would probably not...