Have you ever bought tickets to see your favourite band live, only to then listen to all of their tunes in anticipation as you wonder what their setlist will look like? Well as it turns out, some bands, such as Metallica, are using this very behaviour to decide what sort of songs they’ll play for their fans.

This week marked the 35th anniversary of Metallica’s debut albumKill ‘Em All. Since the release of this landmark record, Metallica have played a pretty fair amount of shows. But amazingly, the group have maintained their desire to ensure they don’t play the same show twice, doing their best to shake up their setlists to give fans a totally different experience every time.

Now, it seems as though technology is helping the group give their fans a truly unique live experience.

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As Quartz reports, Spotify CEO Daniel Ek recently opened up about the impact of the streaming service when it comes to live shows, revealing on the company’s earnings call that some acts use their data to help curate their setlists.

“You have an artist like Metallica, who changes their setlist on a city-by-city basis just by looking at Spotify data to see, which the most popular songs happened to be in that city,” Ek revealed.

“We’ve never before been at a place in time where you could make as many informed decisions and understand your audience as well as we can do now as an artist.”