No music at all when I'm exploring.
I'm like Akira, multitasking all over the place with barely a spare second. I use the audio cues to tell when I need to do something. And then there's the system map. Listening to planets is much harder with music playing, so I simply don't bother with music any more.
The in-game music lasted less than 10 minutes before I turned it off. It's Jim Croft's audio team that provide all the ambience, not Erasmus Talbot's soundtrack.