I'm one who believes that a session can be greatly enhanced by music. I love it when the lady has something playing when I walk in the door. Since my sessions tend to include a "happy hour" component to start, it's only natural that music is a part of that scene.
Many of the ladies I run into seem to be ignorant of how easy it is to get a pretty decent set-up going. You don't even need a CD or MP3 collection. Pandora (pandora.com) for several years has offered a free service that allows you to program your own channel based on artist or even a song (they also have a pay service that forgoes any advertising). You already have a laptop, so get some speakers and you are "good to go".
I thought it would be interesting to start a thread discussing the various musical set-ups people use...might even be useful for the technically (or financially) challenged that has an interest in the subject and is looking for ideas.
...and for the true music nerd, let me tell you about my Squeezebox!