I'd like some thoughts please on what albums and/or artists in these decades were not just good, but defined the music of the era and/or introduced a new musical trend.

When I think of the 80s for example I think of bands like Kraftwerk who were so different. They could be poster children for the synth/electronic sound so prevalent in that decade. Which albums or artists do you think personify the essence of music in the 70s and 80s and stood out as classics?

Any ideas would be appreciated. Thanks!