music quiz

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Hi can anyone help please??? Have one artist to find (have managed the other 99!!) and it is driving me mad...it works on the idea that 2=ABC 3=DEF 4=GHI 5=JKL 6=MNO 7=PORS 8=TUV 9=WXYZ or the number could be its number too...the song is THIS CHRISTMAS and the artists code is 533474...any ideas gratefully received...thanks