It kind of failed if you had a fancy CD player (or CD-ROM drive) that could show the lengths of tracks, if every other song on an album is 3 minutes long, then the last one probably isn’t 30 minutes long.
I don’t know what the point of this post is, other than that it sucks when a modern release removes the hidden track 
and i’ve heard of musicians who’ve put two concurrent grooves of vinyl, leaving the hidden tracks extra hidden
There’s a band that had all their tracks on a serial so you’d get a different experience each time.
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