OLP, sorry it took me so long to get this up there for you. As opposed to loud music, i suggest this alternative... Brain Wave Audio Manipulation. Its a series of frequency specific Audio tones (white Noise) designed to bring about certain effects, masked out by studying brainwave patterns in different situations. They are used alot in self hypnosis, pain relief, astral projection, subliminal messaging, meditation, etc...
My point is, with a decent set of headphones, like earkandy or a good gaming headset, you can really benefit from some of the settings and therir are always new ones for download.
I suggest the transic ones for subspace... helps put you in that trance like state we all love, while blocking out the rest of the world. I have a pretty intense list of audio file on my system here, but there's a pretty good program found here.
http://www.bwgen.com/index.htm
Good luck, hope this helps.