Figures suggest that metal fans are over a fifth more likely to keep listening to core bands like Metallica and Iron Maiden, while fans of the next-highest genre, pop, will tend to listen to a wider range of acts.

Analysts monitored how often a listener would return to artists defined as central to a genre. They discovered that, on a global basis, metal fans stick to their favourites much more often than those who prefer pop, folk, country, rock, hip-hop, reggae, jazz, EDM, classical or blues.

Spotify say: "Metal fans are the most loyal of all. One could also conclude that the more guitar-oriented genres inspire more loyalty in the listener."