Okay, not Abba.

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No, they made great records (and some stinkers), unlike 90% of the fusty crusty old fools celebrated on this thread!!

But the key point is the one about age. When you get nostalgic for the music of your youth, what you are really pining for is not the actual music but the time in your life that it soundtracked. In other words, that state of not-being-nearly-as-old-as-you-are-now (there is probably one word for that in German).