Nah, there's no criteria for this one. The next trade will have a theme though, the one after that won't, and so on. As for how to swap albums, this post should be of some help to ya (skip the first step and you're basically there).
Don't feel bad. I've been trying to get outside of the small niche of prog that I actually like, mainly Yes, Rush, and Pink Floyd, and get into some more stuff from the genre, but I'm finding a lot of the cliche pitfalls in both modern and classic prog rather annoying.
YouTube - Sugarcubes-Birthday (English)
I like the Sugarcubes and Bjork and all, but this track is the classic. It's (dare I say it) a perfect pop song.
Bowie:
1. "Young Americans"
2. "Life on Mars"
3."Queen Bitch"
4. "Rock & Roll Suicide"
5. "Ziggy Stardust"
Bruce:
1. "Thunder Road"
2. "Highway Patrolman"
3. "It's Hard To Be a Saint in the City"
4. "Blinded By The Light"
5. "Lost in the Flood"