Bass

Definitely want the drums to be there first. I think the bass player follows the drummer much more than the other way around. Frankly a lot of drummers don't really follow anyone - everyone else has no choice but to follow them, time-wise. Dave Matthews once said that Carter Beauford was the "Captain of the ship."

We bass players only strike notes with one appendage, whereas the drummer is using 3 or 4 different appendages, so it's easier for us to make minor time adjustments very quickly. The drummer is kind of time-juggling: throwing different limbs in various directions and pre-timing the desired result. But we bass players can focus on exactly when we move one or two fingers.

Yep. I like to have a complete drum track and maybe a scratch guitar/vocal track just to help me track transitions. It's easier for the bass to record in time to drums than vice versa, and likewise it's useful for guitars, vocals, and other melodic instruments to come after the rhythm section is laid down.

Either that or a click track, but my drummer doesn't like playing to a click.