This bit of musical virtuosity blew my mind, and I urge you to spend two minutes watching and listening. In the video below, 26-year-old Ukrainian Aleksandr Hrustevich plays a Bayan "Jupiter-Lux," a sort of mega-accordion with the capacity (in the right hands) to stand in for an entire orchestra (in this case, he's playing parts written for violin, string orchestra, and basso continuo). In this clip, Hrustevich is playing a portion of Vivaldi's "Four Seasons" (Concerto in G Minor), I believe it's from the "Summer" movement, played in Presto tempo (aka wicked fast). (Note: classical music fans, please share more info about the specifics of which portion he's playing in the comments!)
Anyway, just click on this and be amazed.
(Via the amazing Word Surgery blog.)