 In 1974, Macfarlane wrote the song "Cànan nan Gàidheal" ("Language of the Gaels") which criticized the tendency of Gaels to switch to English.The song has been recorded by Dick Gaughan, Catherine-Ann MacPhee, Karen Matheson, Tannas, Dan ar Braz, Gaelic Women, and Tide Lines.An Irish-language version, Teangaidh or Teanga na nGael, has been recorded by the Irish group Cór Thaobh a' Leithid.