Michelle, I think people are motivated by different things. One time in our spin session, the fellas were willing to work out to Cardio Coach #5. They did it and liked it, but they are hard core racing cyclists and like the more bicycle performance oriented Spinervals. They like being told which gear to put the bike in and references to time trials and hills and bike specific situations.
Me, I like to hear the horses in CC#2, the thought of a village of people waiting for my return, references to clouds, the beach, etc. Visualizations. They can have their Spinervals, I'll do my CC's. You reminded me to go change the battery in my mp3 player.
Glad you are getting your bike tuned up, you want the gears to shift properly and the set to be at the right height. Have the bike shop adjust that for you. Too many people ride with the seat too high or too low and that causes problems. Also remember that pedaling while standing will raise your heart rate too. I use that for short sprints and it's effective. It may take a little bit to get used to doing that. Also, whatever saddle you use, your butt will need a breakin time, meaning you are probably going to be uncomfortable.
Have fun!