Let’s play a game of Guess Who? – Music Edition. Here are your clues: they’ve sold 16 million albums worldwide, scored five consecutive No.1 albums on the US Top 200 chart, five gold and one silver-selling albums in the UK and, last but not least, a monster streaming hit that stands on nearly a quarter of a billion plays on Spotify alone.

No, these stats are not the preserve of a rapper or a pop starlet or an acoustic guitar-wielding ...