You can't fully describe the longevity of a piece of music until it stops being played by any significant number of people. The Beatles records from 1965 have lasted fifty years and counting. Someone talking about 40 year old records might have bought Pink Floyd's "Wish You Were Here" in 1975. At some future point, when people have stopped listening to that music in large numbers, only then can we really compare them to something like Mozart.
But if you listening to music whose relevancy has already passed by in a year or three, that's by definition disposable jingle music. And to many people that also makes it garbage. It's rather ridiculous to compare that to any music that's already lasted decades. A century from now, maybe the Beatles will be a forgotten little band, while people still listen to Mozart. But you'd have to be completely deaf to pop culture and popular musical history to claim bands like the Beatles or Floyd are listened to today only because people have happy memories from when they first heard them.