I like this vid, because it shows what a cassette could sound like if it was in good shape, and the player was of good quality.

ABBA tried to sound gritty and failed, but the audio itself is astounding; I’ve heard cassettes and player/recorders at their worst, many of which were mine. I just think this case is remarkable, almost nothing for wow and flutter, not that I can hear. Like I said, impressive, when I remember how playback problems were the rule with most cassettes and the machines that used them.