Insouciance

Well, before The Beatles and Elvis, there was all that, but it was with them that the turning point in music began, which led to a ton of new cool genres. Whether they were the pioneers or just happened to be in the right place at the right time, I don't know.
Sometimes I listen to The Beatles and I don't even understand what I find in them, but I still really like them. Apparently, they just captured the atmosphere, and I was able to feel it. Something light, lyrical... Yum.