K.C.
First of all, congratulations on your upcoming birth! There are a lot of different kinds of classes to choose from and it depends on what kind of birth you plan on having. If you are going natural, I would recommend a Bradley method or hypnobirthing class. If not, education is still important in having a smooth birth. The more you know about what is going on, the better you will be able to handle it and not be afraid. And you may decide after hearing the facts that you want a natural birth. That's what happened to me.
The Vanderbilt midwives website have a few links to different classes in Nashville. That website is http://www.vanderbiltnursemidwives.org/classes.htm
Good luck to you and your family!
-K.