He was the co-founder, musical director, and conductor of the Scottish Fiddle Orchestra from its creation in 1980 until his death in 2011.

His collection of over 600 tunes has been made freely available for download from <<https://thejohnmmasoncollection.co.uk/>>.
This is mentioned on the Scottish Fiddle Orchestra website at <<https://www.sfo.org.uk/john-m-mason-collection-of-tunes-published/>>.
A longer  article about it was published in The Orkney News at <<https://theorkneynews.scot/2025/10/23/treasure-trove-of-john-m-mason-collection-gifted-worldwide/>>.