Amazing that professional musicians still spend their lives trying to figure out the mystery of Led Zeppelin's music.
Can you imagine if they would have filmed all their live concerts, they would be Zillionaires instead of Billionaires !!
This is very rare, so record it before the Zep reps force YT to take it down, it shows them at their best improvising and changing tunes when played live in concert, like Plant said recently, they were great when they were great, that is why he does not want to get the band back together because he can't sing like that anymore.
a lot of guitar magazines include a cd with different backing tracks every month.
karaoke software normally targets a specific range in the eq of the centre channel, which is pretty easy. removing guitars would be pretty hard as they are usually stereo and panned one way or another, and occupy a wider frequency range.
one of the earliest web-based multi-tracking projects i worked on was a cover of 'what is and what should never be'.
it didnt sound anywhere near as cool as that though. our singer sang through a computer mic and our drummer recorded himself on a cassette boom-box... wiawsnb.mp3