This summer, hundreds of thousands of people will flock into fields up and down the country, as festival season takes hold. The vast majority will do so with mobile phones in their hands, and this represents a huge opportunity for the music business.

Just over a week ago, more than 200,000 fans swarmed through the gates at Glastonbury, excited to be in attendance to witness Stormzy, Kylie Minogue and countless other performers and help celebrate its 49th edition.

The idea ...