In electrical engineering, live-line working is the maintenance of electrical equipment, often operating at high voltage, while the equipment is energized.
A lineman wearing a Faraday suit can work on live, high-power lines by being transported to the lines in a helicopter. Wearing the suit, they can crawl down the wires. THEY is the key word here.
In their quest to serenade the Seven Wonders, The Piano Guys tradition thus far has been to mix timeless classical music with contemporary film scores. They also love infusing local and historical culture in their arrangements. For this Wonder they wanted to stay true to this tradition while simultaneously nailing "jungle harmony." as a famous cartoon bear once coined in... Disney's Jungle Book! But in this decision they were confronted with an entangling challenge - to effectively blend the cacophony of Disney Jazz, classical music, Mayan heritage, all while making it epic enough to be filmed in front of a massively-historic, world-renowned stone temple! Did they succeed? I think they did!!