It isn't clear to me that technology would have affected anything that they would have picked up:

"Harmonic topics, of which there were eight, captured classes of chord change, or their absence (eg, “dominant 7th-chord changes” and “major chords without changes”). Timbral topics, of which there were also eight, were things like “drums, aggressive, percussive” and “female voice, melodic, vocal”."

I also immediately mentally leaped to "electronic" music, but it doesn't seem to me that they were looking for that sort of thing.