Bells in Notre Dame Cathedral
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New bells for Notre Dame's 850th anniversary

22 February 2012 Last updated at 11:46 GMT

As Notre Dame Cathedral approaches its 850th anniversary, some of the church's bells are being replaced.

Experts say it is because the current bells do not sound as good as the originals would have done.

The new bells will have a sound closer to the original medieval ones.

The BBC's Hugh Schofield reports.