Lennon, Lorde, Thicke - the problem of the too similar songs

A great read in The Ringer about the cases of too similar songs, of which their creators aren't aware of: "We’re now squarely within a new era of music copyright litigation, signaled by a steep wave of fresh cases and settlements arriving on top of what was already a steadily rising tide. But while plagiarism has never been a larger industry issue than it is today, it also has never been more poorly defined. And given the way songwriters often borrow ideas without realizing that they’re borrowing—a documented artistic tendency that is likely increasing in frequency in our chaotic online world—this latest squall of disputes may be just the beginning of an even larger storm". The latest such case has involved Lorde's 'Solar Power', and Primal Scream's 'Loaded'.