Post Malone and Camila Cabello are battling for Singles Chart supremacy once again

I would love for it to get a big enough gain to pass 'rockstar', but I simply don't see it happening. If YouTube views counted to the charts as they do in the US, maybe, but otherwise I don't see it. Maybe I'm just being pessimistic. I'll hold out hope, as I have been doing for the past month or so ever since it started looking like a contender for #1.

Like I said in another reply to you, as long as 'Havana' doesn't drop for three consecutive weeks, it's still in with a chance. It'll probably challenge 'Rockstar' until the start to middle of November, but if it's not at the top after that, it's over for 'Havana'. At least it hit #1 in Scotland though. :)
Either way, it could be the third biggest song of the year not to reach #1, after 'Castle On The Hill' & 'Galway Girl' of course.

That is very true. I'm still hoping that it can hold out for long enough for 'rockstar' to be hit with the 300:1 ratio, even if that is over a month away. The biggest chances it's got are if it gets a huge bump this week because of the Teen Awards and the music video, combined with a drop from 'rockstar', or if 'rockstar' continues to drop at such a rapid pace as I mentioned in another reply.
I'd put it at the 4th biggest not to hit #1. 'Unforgettable' was (and is) a massive hit, and ironically it seems like you forgot it. :D

Although this reminds me: what allows a single to go back from a 300:1 ratio to the normal 150:1 ratio? 'Perfect' must've been hit with the ratio in it's first chart run, but I would seriously hope that it's now back on the 150:1 ratio. Is it just if a song sees 3 consecutive weeks of gain?

'Rockstar' seems to be gaining in both sales & streaming though, so I don't see that happening just yet, considering that the official video for 'Rockstar' is probably coming too.
Haha, yeah, apparently 'Unforgettable' is currently in the Top 10 biggest songs of 2017 so far & it does have good staying power after all, even if it is under the 300:1 streaming rule now.

Yeah, I think if it gains for three consecutive weeks, it'll go back to the 150:1 ratio.
In that case, it's definitely back on the normal ratio now, hence why it's blasting up the chart each week! :)

'rockstar' seems to be gaining in sales, but as I said in a reply to you on the main chart, it seems to be decreasing fast in streams (at least on Spotify). In the past 3 days it's pattern in the UK has been: 627,000 - 575,000 - 494,000, while 'Havana's pattern has been: 388,000 - 393,000 - 334,000. The gap between them has shrunk from 239,000 to 160,000 in just 3 days.

Makes sense. I originally predicted that 'Perfect' would re-enter the lower reaches of the Top 10 at best, and that it didn't have a chance of beating it's personal best of #4, but it seems like I could be wrong. :D It's not doing great on streams though (on the streaming chart 'Shape of You' is still above 'Perfect', which makes me wonder how much better 'Shape of You' would've done if it wasn't for the 300:1 ratio.

So are those the streaming figures, or the overall figures?
Here's how 'Havana' could get to #1: it gains at least once before 'Rockstar' hits Week 8 on the chart & 'Rockstar' continues to drop over the next few weeks. That way, 'Rockstar' would fall to the 300:1 rule before 'Havana', meaning that the latter would be very likely to hit the top given there was no other major release.
Haha, why did the OCC make the formula so complicated? :P

It could be that 'Shape Of You' is still doing good on streams, but yeah, 'Perfect' is mostly as high as it is overall thanks to sales.

Those are the figures for the amount of daily streams each track got in the UK (as shown by the UK Top 50 playlist on Spotify). Obviously I have no idea how either track is doing on other streaming services, but on Spotify the gap is closing rapidly. I've no doubt that it will level out a bit, but even if it just stays where it is they've come a lot closer. The reason they both had such a big drop on the last day is because those are the figures for Sunday, while the first and second are for Friday and Saturday, respectively, which obviously have much higher streaming figures than the rest of the week. But while 'rockstar' lost significantly on the Saturday, 'Havana' gained, albeit slightly.
Yeah, the rules are pretty complicated, but because I have such an obsessive nature and because my current obsession is 'Havana' getting to #1, I worked that if 'Havana' gains by any amount on it's 14th week on the chart, it'll still have the normal ratio on it's 16th week on the chart. This is important because 'Havana's 16th week on the chart is 'rockstar's 10th week on the chart. If 'rockstar' declines on it's 8th, 9th and 10th weeks on the chart, and if 'Havana' gains on it's 14th week, 'Havana' will go to #1 (provided no other songs overtake it in that time, obviously).

I bring good news this morning! Not only did both of the comments that got detected as spam on this account (my 2nd one) get unmarked as spam (which is why you'll now see 2 near-identical replies to one of your comments on the main chart), but 'Havana' has also gained!
While the gap between it and 'rockstar' has gained slightly on Spotify since yesterday (160,000 - 171,000), 'Havana' saw a 15.57% gain while 'rockstar' only saw a 12.75% gain! This could definitely mean that good things are to come.
'Havana' has also shot back up to #1 on Google Play after falling to #3 yesterday (with 'rockstar' down at #3 now), and it holds steady at #1 on iTunes. I don't think it'll have enough of a lead in sales to pass 'rockstar' (since, even for 'Havana', streams still make up 2/3 of it's combined sales. Streams make up 4/5 of 'rockstar's sales), but the gap is definitely closing and 'Havana' should see an increase in sales this week!

EDIT: 'Havana' is also #1 on Deezer in the UK, with 'rockstar' at #2. While Deezer makes nowhere near as much of an impact on the charts as Spotify, this is still promising to see.

Not quite - basically a song which is on the 300:1 ratio can go back to 150:1 if either

a) The song has a 50% increase in sales/streams in one week or

b) at the request of the publisher. This is what happened with Perfect and allows them to promote new singles from current albums

Once a song is back on the 150:1 ratio the counter gets reset to zero allowing them to have a least 9 weeks at this ratio.

So if a song gains 43% in one week, 35% the next and 47% the next, it won't go back to the normal ratio unless the publisher requests it? I feel like they need to change it so if a song gains by more than 10% for 3 consecutive weeks that should also put it back on the regular ratio.

Also, if 'Havana' were to fall to the 300:1 ratio, could Camila's label just request for the normal ratio to be re-applied on the grounds that 'Havana' could still be a prime contender for #1?

Oh, fair enough, thanks for clarifying.
50% seems too much in my opinion, so I see a lot of people putting a lot of promotion into songs that have been on the charts for around 11 weeks & are declining in performance.
Do the annual charts take these new streaming rules into account, or are all songs on that based on the 150:1 ratio?

I'm pleased to hear that you're having less trouble with your comments on Disqus than you were earlier in the week. :)
It's a shame that YouTube doesn't count towards the charts in 'Havana's case, because it's both #1 on views & trending over here right now (as well as the rest of the world). A good sign is that it increased its lead on iTunes & 'Rockstar' fell back. 'Rockstar' appears to have about a lead of 150,000 daily streams on Spotify in comparison to 'Havana' though.
Tomorrow, I'm predicting about a 1,000 total figure lead for 'Rockstar', but it's really too close to call this week to be honest. I don't see any more chances (other than a discount) that 'Havana' could have after tomorrow.