SYSTEM OF A DOWN frontman Serj Tankian was the musical guest on last night's (Thursday, May 1) episode of NBC-TV's "The Tonight Show with Jay Leno".Watch footage of the performance below. Tankian recently told Billboard magazine that he would like to perform concerts online in order to reduce his carbon footprint and help the environment. Tankian explained, "I've had an idea for a long time, which might sound a little crazy, but I really want to look into holographic touring. I think we could reduce our need to travel if we could project ourselves into meetings and concerts. We have the technology, and we're not using it right now." Tankian said he envisions broadcasting a performance in real time from his home studio. The singer added that the idea would "open up a whole new world for touring shows wouldn't have to be limited to bars or clubs. There would be no travel costs, so bands with very little money could play shows, and tickets would cost less." Tankian, like RADIOHEAD frontman Thom Yorke, has acknowledged that being in a rock band isn't the most environmentally-friendly profession around, with the high fuel costs and emissions associated with touring and the massive use of plastic in manufacturing CDs.