YouTube's latest unexpected, and unexpectedly amazing, amateur tribute to a classic song … isn't exactly amateur. It comes from 2Cellos, a Croatian duo that knows how to absolutely shred (and gallop, and solo) on their beautiful classical instruments.

So they made an Iron Maiden music video. Yes, the cellists begin with classical staple "William Tell Overture" before suddenly, for a difficult crowd, ripping into "The Trooper." The song, off 1983's Piece of Mind, is one of the metal pioneers' strongest, most recognizable pieces of work. Check out the 2Cellos rendition of one of Maiden's finest hours -- replete with headbanging goodness -- below. "The Trooper" kicks in at the 1:37 mark. Careful, though: you might start a moshpit at your desk. It's that heavy.

The clip for "The Trooper Overture" has been viewed more than 367,000 in a day. Some of 2Cellos' many popular clips include live performances and music videos of Michael Jackson's "Smooth Criminal," (7 million views) AC/DC's "Thunderstruck" (26 million views) and, of course, Rihanna's "We Found Love" (they also have two albums available to stream):

Soooo … when's the live 2Cellos tour coming to town? "The Croatian duo toured in Europe extensively over the summer and has upcoming tours in Russia, Australia and the U.S. Their third studio album will be released in early 2015," writes Blabbermouth. Perfect! Also, the site notes that 2Cellos have appeared on The Ellen DeGeneres Show, The Tonight Show, and The Bachelor. Now they just need to do a 2 Chainz song -- "two celloooos!!"