A few of us are actively promoting ythis round the Clubs in S E England - I am a Registered Song Thief , but I AM an honest thief and always try to credit my sources .
   "Sung By" or "Performed By" I will accept , but in MY book "By" is an abbreviation for "Composed/Written By"
    'Black is the Colour' is a case in point - Trad , arranged by J J Niles , collected by Christie Moore from Hamish Imlach , but ALWAYS introdeced as " A Christie Moore Song " !!!!!!!!