It's an old demo of a Melbourne band called the Editions, and due to being played on crappy cassette players for many years, the tape is really badly wound (ie it has those little "ridges" where part of the reel of tape sits up higher than the rest), to the point of being unplayable.
It forwards and rewinds easily enough, but when I actually try and play it, the tape gets to a point where it plays r-e-a-l-l-y s-l-o--w---l---yyyy and then just stops fast. Nothing I do can get it to play past that point.
I've tried forwarding it back and forth a few times, taking it out of the cassette case and smoothing it down with the flat of a butter knife, and putting it back in a better case (a TDK SA90), but no dice.
I really really want to rescue this tape, as it's very hard to come by, so if anyone has any suggestions, I'll be eternally grateful.
X-posted to a whole bunch of places.