Well, I don't know if you've seen audiograms before or not. This is a nice diagram that shows where common sounds fall on an audiogram chart:
To be legally deaf, the majority of your hearing must be in the darkest grey area - profoundly deaf. My audiogram looks something like a a backwards J - I am "just" severe in the low frequencies and sharply drop off to profound in the higher pitches. Even with hearing aids, I can't use a phone, I use captions for the TV and I lipread. Hearing aids can only amplify sound so much without damaging what there is left of hearing - even at max level, it brings up my hearing to the mild/moderate range in the lower pitches (so I can hear about 2/3 of human speech sounds), but I'll never be able to hear the high pitches - that's still sitting in the profound level.
In addition to not hearing higher pitches, hearing aids just aren't as clever
as real ears. I can't distinguish between many similar sounds; I can't pick out what I want to hear and focus on that - everything comes through at equal loudness.
Because of limitations in what a deaf person can hear and how well they can hear what they can hear, many deaf people don't bother with music. For some reason, I do like music, but it takes me many listens before I can start to sort through the noises and get used to the tune enough to decide if I like it or not.
To me, the good soundtracks seem to have enough richness in the sound frequencies that I hear that it sounds like a good tune (for all I know, there is more I am missing out on, but there is enough for me to enjoy) and many of the ones I like aren't so busy with similar-sounding instruments/melodies/notes that its all jumbled up in one blaaat of sound. I figure its because many soundtracks are designed not to compete with voices, battle sounds, etc. so they're not too busy?
I tried other types of music but they just seemed waaaay more hit and miss. One instrument is boring - I can't hear the difference between enough of the notes to get a good tune. I like having multiple instruments (or stimulated ones) that each instrument is its own pitch and melody line. But when you get to the level of an orchestra, then it gets too busy and I have trouble sorting through all the NOISE.
I have a special device that jacks my iPod directly to my hearing aids and a program that works with the iPod which is set to optimize the sound for my audiogram pattern. Nobody else can hear it (which makes my husband happy :p - before I got the iPod set up, I used to play music loud enough to shake the walls :-\