found: Griffith, M. The Welsh folk song heritage [SR] 1975:label (Mari Griffith, vocals)
notfound: All music guide WWW site;Encyc. of pop. mus.;Encyc. of folk, country and western music
found: Root of the Tudor Rose, 2015:t.p. (Mari Griffith)
found: Letter from author to NLW, received 13 July 2015(Mari Griffith ; born 5 May 1940)
found: Mari Griffith WWW site, viewed 13 July 2015(Mari Griffith ; from Maesteg ; member of the BBC Northern Singers, based in Manchester ; worked for the BBC and BBC Wales ; worked in London and Cardiff as a broadcaster and singer (soprano) ; worked in Welsh and English)