In the intended sense of the question, Mike Moffat is the first that comes to mind. He's bringing the next generation of listeners into the world of good reproduction.
If you want to broaden the question to overall impact on listeners, I'd consider Sean Parker, who created Napster, the first domino leading to the derailing of the entire recording industry profitability model, and now sits on the board of Spotify. As an aside, he's brilliantly portrayed by Justin Timberlake in the Facebook history film, The Social Network. Cheers,
Spencer
If you want to broaden the question to overall impact on listeners, I'd consider Sean Parker, who created Napster, the first domino leading to the derailing of the entire recording industry profitability model, and now sits on the board of Spotify. As an aside, he's brilliantly portrayed by Justin Timberlake in the Facebook history film, The Social Network. Cheers,
Spencer