[Kojak]

A stream doesn't count the same as one bought for download or physical single. It's 100 streams to 1 sale for the least amount of effort. It's not ideal but it's a far more accurate system to what's popular than a purely sales chart.

It's not even that because they have different stream to sale ratios for things like older records, "songs in decline" and a limit on how many songs an artist can have in the charts at once (after Ed Sheeran kept taking the entire top 10 every time he released an album), so it really isn't representative of anything any more.

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BBC4's TOTP subtitles are now extremely informative and helpful

I think if they were hypothetically to bring back a version of TOTP, it might be better to base it around the album charts, which is what the French version did when that was a thing circa 2003.