[quote name='51m0n' timestamp='1340982209' post='1712430']
I would put Multitrack recording at the top of the list, it has had a far wider ranging effect on the sound of pop/rock than every other thing in the list. And yes, it definitely has a sound, its [i]the[/i] sound of pop.
[/quote]
Ditto. I also reckon the Korg M1 piano sound did more for popular music than the DX7 one, but that's just my opinion.