[ivan_2068]

Great thread, I'm new in this forum but old in some others, and never saw a similar thread before.

I can't vote for just one option, because I believe some of the facts mentioned are really important for the change of music as we know it, I'll mention some:

Set drumming: Of course the developement of the drums is basic for the big change, percussion passed to be an important part of the music instead of simply an auxiliar instrument, one man alone can handle the rythm instead of needing many percussionists that very often were not born to play together.

Electrification: Jazz and Rock couldn't develope without electrification, not to talk about Prog' Rock with Mellotron, Hammond, Organs, etc.

The switch from musician as performer of someone else's work, to musician as composer: Basic!!!! the performer can express his own feelings and inspiration, also knows what music is perfect for his style and skills. When playing other composer's music you can't transmit what the composer wanted to tell the audience.

Live Touring: I believe you don't fully understand a band until you are in front of them, people can identify better with their favourite musician when part of the audience. Gabriel Genesis shows told the audience more of the story and songs than a simple album (extrange thing to admit when I heve never seen them alive except on bootlegs).
Concerts are also important to realize the exact valuse of a musician or band, because with today's tecnology you can do magic in a recording srudio, but the audience is a monster of 1000 heads ready to find the smallest mistake and lapidate you or to love you instantly.

Iván

PS: Please excuse me for my poor english, it's only my second language.