Technology has definitely had a huge impact on music. Entire genres exist now that wouldn't have been possible about 30 years ago really which is quite something. I'd also agree with Rengori about technology damaging music due to the insistence of some artists to simply include as many technical additives to the music which can sometimes spoil it.

I think technology has also allowed artists to reach a much wider audience. Music television channels and the Internet simply didn't exist until relatively recently (20 years or so for music channels?). Of course there's also the downside from the record companies' perspective in that Internet = free music for a lot of people.