Another Green World, by Brian Eno (1975): My first foray into electronica and I didn't even realize it at the time. I picked this up used at a place that allows you to look at the liner notes before you buy, so when I saw the lineup of people contributing (Phil Collins, Percy Jones, Robert Fripp) and encouraging (Fred Frith, Ian MacDonald, Phil Manzanera, Pete Townshend, Robert Wyatt), I had to check it out. I'm glad I did. It treads a fine line between sonic experimentation and pop sensibilities. The results are always interesting and frequently catchy. You can't beat that!