ElephantSack

I disagree. Every time I have ever recorded in any studio, drums are always first to be laid down to track. One, they're the biggest and most complicated instrument to record. Two, rhythm and beat are the the foundation of the song. And when you record, its just like building a house. You start at the bottom with the foundation, get the basic structure of the song put up, and once its well put-together, you add on whatever extras come to mind.

My advice would be to start over. Record the drums first, then move to bass and guitar. And lastly, add the vocals. Trust me, it will be a lot easier next time around.