Here’s a few pointers and helpful reminders to get you started:1.

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The entry date is when the song appeared in the top 10 for the first time (week ending, as published by the Official Charts Company, which is six days after the chart is announced).

One-hundred and thirty-eight singles were in the top ten in 2011.

The chart week runs from Friday to midnight Thursday, The Top 40 chart is first issued on Friday afternoons by BBC Radio 1 as The Official Chart from to , before the full Official Singles Chart Top 100 is posted on the Official Charts Company's website.

A rival chart show, The Vodafone Big Top 40, is based on downloads and commercial radio airplay and is broadcast on Sunday afternoons from to on 145 local commercial radio stations across the United Kingdom.