And particularly with "once a year" songs, it hardly pays to learn them by heart. I can sing slews of Christmas carols (several times more than I have years to my credit)--and none of them completely from memory; even with "The Twelve Days of Christmas" I'd be guessing at the sequence of gifts without a crib sheet. Six days to get the tune and scansion down? No sweat! I'd even tackle "Mrs. Fogarty's Christmas Cake" in six days. (Incidentally, given the longevity of the cake, I'm sure it'd serve for a New Year's celebration, too--or Easter.)