Mikael Akerfeldt's stuff.

Steel was the silly little traditional metal thing Mikael, Peter, Anders Nordin, and Dan Swano threw together while recording Morningrise. I thought Dan did the vocals, tho... they're the ludicrously high-pitched kind that usually accompany power metal, I seem to remember reading something with Dan where he mentioned how that was hard on his throat.

What were the songs called again?

Heavy Metal Machine, Say Goodbye (to love), and another one, I think (or something like that, I'm going on very vague memory here).

There was a link to the MP3's floating around the forum at some point, check the archives or see if someone will send them to you.