When most people rave about seeing an "electrifying" performance, they typically aren't talking about witnessing real lightning on stage. But for the band ArcAttack, harnessing the power of 1 million volts of electricity -- and turning that energy into music -- is business as usual. ArcAttack creates music using two giant structures called Tesla coils, which were invented by the eccentric genius Nikola Tesla in 1891, as part of his dream to develop a way to transmit electricity around the world without any wires. Now, more than 120 years later, a band that is described by its founding member, Joe DiPrima, as a "mad scientist-slash-rock group," has found an innovative way to use these tower-like structures for entertainment. The band performed Saturday (April 23) here at Smithsonian magazine's "The Future Is Here" festival, a three-day event that explores the intersection of science and science fiction.