Ah interesting. Still don't understand what that means! But I know it's a thing.
From the OCC. I know you didn't ask, but I'm going to post it anyway.
How does the Singles Chart work?
New releases will have a streaming ratio applied to them in order to calculate the number of streams equivalent to a sale. The ratio used will depend on the age of the release and whether the listener streamed the track or album using a premium or an ad funded (free) service.
Standard Chart Ratios (SCR)
New releases will have a streaming to sales ratio of
100:1 (in the case of premium streams) or
600:1 (in the case of ad funded streams) applied.
Example:
A release picks up 15,000 streams this week. 9,000 of those streams are premium and 6,000 are ad funded. The release will have a total of 100 chart sales (90 premium, 10 ad funded).
Accelerated Chart Ratios (ACR)
Using only SCR to calculate the chart meant that a number of singles would stay in the charts for months following release with new releases finding it difficult to impact upon the charts. In order to keep the chart fresh, Accelerated Chart Ratios were introduced.
After 3 consecutive weeks of decline a stream to sale ratio of
200:1 (in the case of premium streams) or
1200:1 (in the case of ad funded streams) will be applied.
Example:
A release picks up 15,000 streams this week. 9,000 of those streams are premium and 6,000 are ad funded. The release will have a total of 50 chart sales (45 premium, 5 ad funded).
What else do I need to know?
Accelerated Chart Ratio cannot be applied to any product with fewer than 9 weeks on the chart (i.e. ACR can only be applied in the 10th week on the Top 100 chart, at the earliest).
SCR and ACR apply regardless of whether the stream is audio or video.
“Decline” is defined as negative week on week variance of combined audio and video streams below the combined streaming market rate of change week on week.
Automatic Resets: A track within the Top 100 on Accelerated Chart Ratios (ACR) which is within 3 years of release can automatically return to Standard Chart Ratios (SCR) if its streams total increases by 25% greater than the streaming market change week on week.
Example:
A track with a week on week variance of +14%, in a week where market variance is -11%, would be automatically reset.
A maximum of three singles within the Top 100 by the same artist will be chart eligible. These will be the three most popular singles in a week based on combined sales and streams.