I agree. The music that plays in the various discovery flights is really good, and each one individually themed to the location. They are suitably ambient and reminiscent of the trailer themes.
I actually made a wishlist thread suggesting they could be made available in free flight, as there was obviously a lot of work put into them and they were kind of wasted just tied to the discovery flights:
That said, I generally fly without music anyway, but the option would be nice.