In reply to:

So I ended up with the excitingly titled "Track 99" and have no idea what it is really called (Can't guess it from the lyrics, typical NIN) but I know what it is so it's cool.



the album you're refering to is broken. tracks 98 and 99 are called 'physical' and 'suck' respectively.

th reason for this particular arrangement on the disc was because broken originally came with an additional 3" CD with those two tracks but record stores kept selling them as two separate CDs to make more money. tvt then countered by just slapping the tracks on the next production run to avoid upsetting nin fans.

if there is another nin album with hidden tracks it'll be news to me
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It seemed like a good idea at the time.