The number of singles being bought has been falling for years, and it's hoped by including downloads and the new-style singles the chart will get bigger again.
The two-track CDs will have an A and a B side, run for less than 10 minutes in total, and offer no free gifts.
The older maxi singles can have three tracks, plus remixes too, but must run for less than 20 minutes.
Including downloads is difficult at the moment because it's hard to make sure sales figures are accurate, but chart bosses still think it's important to include them.
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