Jonathan Shaw, director of online lights supply firm Christmas Lights Direct, said: "It"s been a very good year for us. We"ve sold almost everything we had.

乔纳森·肖是一家名叫“圣诞灯火管理”的网上灯饰供应公司的主管，他说：“今年是我们生意最好做的一年，我们卖光了几乎所有的货物。”

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"What our unique proprietary technology is able to do is take the poor quality on-camera audio from fan videos, and we analyse that and can see the patterns, even though it's very weak and distorted, " explains Cathal Furey, co-founder of the firm, 45sound.

BBC: Should music fans stop filming gigs on their smartphones?

"It's very telling that no one is talking about numbers, " says Michael Gartenberg, an analyst with research firm Interpret.

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