I love music while I'm Orbiting. WHAT music I want to hear depends on what kind of mission I'm on.
For example, if I'm doing the KSC->WIA suborbital supersonic run, I listen to this:
No contest there.
If I'm already in orbit, I'm listening to something mellow like
Space Man by Smash Mouth (which oddly enough, I can't find on Youtube...)
Edit: Here, just to give you an example:
For launch, some good hard and fast techno* or drum and bass is good. Things like these:
Now, reentry is a different story entirely. You need something
HOT for landing. So a couple of suggestions follow:
* applies here, too.
Of course, there's the occasional exception on reentry as well:
[ame="http://www.youtube.com/watch?v=iPYF2p-cGx8"]Top Gun - Danger Zone (Music Video) - YouTube[/ame]
As for interplanetary transfers... well. You just put your playlist on random and listen to whatever comes up.
* Shut up, Lambo.