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The Mystery Top 40 is a weekly one hour chart countdown of the 40 biggest selling songs from 'This Week In A Mystery Year'

All you have to do is figure out the year before we reach the number 1 song.

We count down all the numbers from 40 to Number 1 and you will always hear the Top 10 in full.

The Mystery Year can be anywhere from 1970 to 2019.

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