I cant stand listening to the GT5 music while racing, but I do enjoy listening to my own stuff while playing periodically. I mostly don't listen to music while racing because I love hearing the sound of the engine, but for an endurance race, music for sure.
I usually run all my music on my computer because I can run it in a multitude of configurations with my receiver or my pc speakers, I can change the volume of the pc, and the song number that's playing with my remote. Having a large hard drive enables me to have my entire music collection downloaded from CD as uncompressed .wav format.
As far as trance goes, I listen to
www.di.fm mostly. I always listen to Armin van Buuren's show on every Thursday.
Some of my favorite trance songs at the moment:
Maor Levi - Shapes
Mat Zo - Rush
Mat Zo - The Found
Nervous Testpilot - Imaginary Cities
PooNyk and Oxide pres. Aquatoria - Saltwater
Accendo - Regulus
Monogato - Miami Vibe
Oliver Smith - Cadence
Running Man - Fantastic Voyage
The Blizzard and Omnia - Metanoia