It depends on
the music and the venue. If possible, using amplifiers
for the guitar and bass is more ideal -- the musicians will have more
control over their sound and not have to rely on the sound person, and
this is a good thing.
Not if you are the sound guy. One of the more common annoyances was
guitarists with Marshall stack(s) who have more power than the entire PA
and won't turn down so that people can hear the rest of the band...
That's just rude -- and I use Marshalls myself.
-- Brett
--
Programmer by Day, Guitarist by Night