The most basic comment is a question: Who is this guy?

If you follow the leads, this Everest of electric-guitar virtuosity, like so many other online artifacts, turns out to be a portal into a worldwide microculture, this one involving hundreds of highly stylized solo guitar videos, of which funtwo’s is but the most famous. And though they seem esoteric, they have surprising implications: for YouTube, the dissemination of culture, online masquerade and even the future of classical music.

JOHANN PACHELBEL, the great one-hit wonder of the baroque period, originally composed his Canon in D Major for three violins, at least one chord-playing instrument (like a harpsichord or lute) and at least one bass instrument (like a cello or bassoon). With its steady walking rhythm, the piece is well suited to processionals, and the bass line is extremely easy to play, a primer on simple chords: D, A, B minor, F-sharp minor, G. A sequence of eight chords repeats about 30 times.

The exacting part is the canon itself: a counterpoint played over the bass, originally by the three violins. The first violin plays variation A, then moves on to B, while the second violin comes in with A. By the time the first violin gets to C, the second starts in with B, and the third violin comes in with A: like three people singing “Row, Row, Row Your Boat.”

With 28 variations, the piece becomes supercharged with complexity only to revert to a simpler structure as it ends. If you hadn’t heard it a thousand times before — in the movie “Ordinary People,” in commercials, at all those weddings — it might blow you away.

Last year Jerry Chang, a Taiwanese guitarist who turns 25 on Thursday, set out to create a rock version of the song, which he had been listening to since childhood. It took him two weeks. Others, like Brian Eno, had done so before him, and some listeners say his arrangement is derivative of one composed for the video game “Pump It Up.” But one way or another, his version, “Canon Rock,” rocked.