Bach's Toccata and Fugue in D Minor is probably the best-known musical work for organ in the world. It's routinely used as the 'acid test' for newly-constructed and rebuilt pipe organs; if they can't play it well, they need re-tuning or more extensive rebuilding. No self-respecting classical organist would omit it from his or her repertoire. Here's a good version from YouTube (one of many).
Courtesy of Grouchy Old Cripple, I came across this rock/metal version that's a remarkable transcription of the piece. I'm generally suspicious of such transcriptions of the classics, but this one is good enough that I think J. S. Bach himself would probably have nodded approvingly.
The guitarist calls himself 'Johann Sebastian Orpheus'. He has his own YouTube channel, and has released a CD that looks very interesting. I think I'm going to listen to a few of its tracks on YouTube, and if they're all as good as this one, I'll be buying it. (No, he's not paying me to advertise for him; I just like his music - at least, what I've heard so far.)
I guess J. S. Orpheus is operating in the same tradition as Jerry C's justly famous rock version of Pachelbel's Canon. In case you haven't heard it, here's the original version of that much-copied transcription.