these lasers to sweep across the site and precisely locate all of the helmets. this then taps into the site co—ordinate system to put the ar building exactly where it should be in your vision. so would you sign off this piece of works? no, they forgot to put this on. this is just shoddy. this is shoddy. building buildings is a large, complicated, messy business, and it's been a surprise to find out that things don't always go to plan, literally. but maybe with a system like this, we'll see fewer missing hoofer doofers in the future. hoofer doofer? technical term — move on. now, the modern music business is defined by technology, from the way that our favourite songs are created right through to how we listen to them. but one key part of the industry, namely how people actually get paid, is still playing catch—up, as paul carter has been finding out. what is the music industry?