I never actually had an opportunity to see the Electric Light Orchestra in concert, the closest I got to that was watching a show broadcast on HBO back in 1978.  I don't know if it's the same show contained here; my memory is a bit fuzzy regarding a 23 year old show.  All I remember from that experience was how "cool" it was.  As a 13 year old in the year of Star Wars, anything with a spaceship and lasers was all that mattered.  The music was secondary.  Of course, as I grew older, I paid more attention to music, and always had great appreciation for Jeff Lynne's contributions to popular music. And this DVD is a nice offering well worth its price.  Now I knew when purchasing this, I would not get crystalline sound quality.  After all, back in the 70's, there was no such thing as digital sound.  But the sound quality in the Wembley show is actually very good, much better than some of the concerts released on DVD from the same era (Yes Live in Philadephia 1979 is one painful example of a bad one).  It does sound like there are some "backing tracks" in the audio mix, but it is really nothing annoying given the quality of the performance.  Picture quality does leave a bit to be desired; not much (if any) better than VHS, and with dated video production effects.  But then again, this was the 70's!  The real plus here is the full album length video for Discovery.  This is almost like a two-for-one deal in just this section of the disc:  a great album with very nice sound quality, and some enjoyable "performance" videos.  This was a few years before MTV, when the  promotion of an image was less important, and videos actually served to promote the music.  Of course, the production is a bit "outdated" as well, but if you do get into some kind of "retro" mood, you might just find it enjoyable.  Highly recommended if you enjoy ELO's music and want to see them captured at their peak.  Well worth the purchase price and more.