In the last few weeks we have seen a succession of releases initially taking iTunes by storm, among them Drake's More Life, Kendrick Lamar's Damn and, just last week, Gorillaz's Humanz, all of which topped our Friday snapshot of world activity by racing ahead in upwards of 40 territories on day of release.

The impact they make digitally in those first few hours doesn't always translate into a mass of subsequent No.1 positions on official charts, where that initial ...