This has probably been discussed in other forums, but it would be interesting to see what people have to say about psy downtempo.
From what I gather, the majority of a live set is programmed on the artists' laptop. I've seen artists tweaking knobs on, to be honest, I don't know what, and occasionally a more traditional instrument - recorder, percussion, guitar etc. My questions are a) what does the knob twisting actually do and b ) what extent of spontaneity is involved in a live performance in your knowledge? I'm sure the latter varies from one artist to the next, so what are the limits in each direction? What is the smallest fraction of pre-recorded material that can be brought into a live set?
Be sure that I'm not complaining about anything here; as long as the music coming out of the sound system pleases my ears, I'm happy. Having said that, I tend to think that there is very little added to an average of a 90% pre-programmed set. Full-band sets are excluded of course, as are DJ sets where music is payed in its original form.