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The battle for the Chritstmas No 1
Katie Melua and the late Eva Cassidy
Track: 'What a Wonderful World'
Currently No 1, this stripped-back duet between Melua and her deceased heroine is a cover the classic Louis Armstrong hit. The single is only available via supermarket Tesco and may not have the X Factor, but it does have the charity factor, with all proceeds going to the British Red Cross. Track: 'What a Wonderful World'
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