A hidden search feature turns smartphones into mobile Christmas caroling karaoke machines. Every year Google stashes an Easter egg in one of its services as a yuletide treat and 2013 is no exception. However, it is confined to mobile devices. To unlock the feature and enjoy some spontaneous Christmas fun, simply Google the term "let's go caroling" on any Apple or Android phone or tablet and a list of five classic Christmas Carols will appear.
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