Haha, I've got the knack! Post would be too big if I mentioned the things I dislike. Huge drop for Shape Of You though there with Castle not dropping at all; I thought they'd keep roughly the same trajectory.
I know that the data is mainly automated through a database and there might be some degree of auto correct to it. So some random radio play of a song all those weeks back must have been similar enough in the records that aircheck thinks it's the same song
It's a bit like when songs have had last.fm pages for years before existing, though admittedly I find it bizarre that it happens here. It's definitely happening though because Passionfruit has one play too many in life spins when it entered, despite the title not even being known until it was released
You'd think so but for some reason Spotify are pushing this hard, so I can see it cracking the top 50 on ARIA on the June 26th chart, it just got added to the most popular playlist in Australia (and has been on the biggest one in the world pretty much since release, despite only being big in North America).
It's been around #105 on Spotify lately and it'll jump up to the 60s once this playlist add takes effect tomorrow.
My vague understanding is that the way aircheck operates is that a lot of tags are automatically combined if they're 'close enough' to ensure an accurate collection of data (since not every station monitored is going to have songs tagged exactly the same way). This can cause false positives where random stuff that isn't the correct song gets picked up like this, and since weeks in accumulate even when the songs have 0 plays (eg Perfect was probably played when the album came out, but it probably wasn't played every one of those 42 weeks), you get stuff like that. However, Shawn got that applied in the middle of his chart run, so it's also possible that a play of the song was tagged with the wrong date. Without comprehensive access to the data (which is available but VERY expensive), it's only my best guess.
I also remember that Katy Perry's "Part Of Me" had a weeks figure corresponding to December 2010, which is when a demo of the song was leaked, even though it wasn't officially released until February 2012. According to Wikipedia, "There's Nothing Holdin' Me Back" wasn't even recorded until August 2016 (~70 weeks ago), but that shows that the weeks figures are very loose in what they pick up.
"The Chainsmokers and Coldplay’s ‘Something Just Like This’ was the most played song on Australian radio this year. The smash hit, released on 22 February, was spun 21,421 times across 29 stations with Nova 919 Adelaide playing the track the most, accounting for 1,397 spins.
It was a big year for The Chainsmokers, with their singles ‘Paris’ and ‘Closer’ also featured on the Top 100, in at No.29 and No.82 but neither could match ‘Something Just Like This’, with airplay that is the equivalent of playing the track on repeat for 59 days.
In second place was Shawn Mendes’ ‘There’s Nothing Holdin’ Me Back’ with 20,322 spins – an impressive feat as it did not receive any spins in the year’s first quarter – its first play occurred on 20 April.
Ed Sheeran stormed the Top 10 with ‘Shape Of You’, ‘Castle On The Hill’ and ‘Galway Girl’ at No.3, No.4 and No.7. Combining all of his singles, remixes and collaborations, Sheeran was the most heard artist on Australian radio of 2017 with a grand total of 79,609 spins across 48 stations.
Shining the spotlight on artists closer to home, Lorde’s ‘Greenlight’ was in at No.10 receiving 15,454 spins with Jessica Mauboy not too far behind at No.25 with 12,705 spins. This year, 13 Australian/New Zealand acts were featured on the Top 100 Most Played Songs including Starley, Pnau and Peking Duk in at No.34, No.43 and No.45."