This is such a great topic. I also have hearing loss at the high-end frequencies.
I purchased the top-of-the line Starkey hearing aids, thinking they would make music sound fantastic once again. I was disappointed to discover they didn't. Per the audiologist, hearing aids are designed to improve hearing from other people, not music. She even setup a "music" mode, but I found it didn't work very well.
As others have noticed, if you cup your hands behind your ears when you wear hearing aids, music sound significantly better. I'm not sure why this works, but it does. However, it's not practical (or comfortable) to listen to music with your hands cupped behind your ears. I wish someone would invent a device that has the same effect -- I would buy immediately.
My only suggestion is to buy speakers that compensate for the sound frequencies where you have hearing deficiencies. I have hearing loss at the high frequencies, so I enjoy listening to speakers that others would consider bright (such as B&W or Paradigm).
An amplifier that has a built-in equalizer might also do the trick, but I personally haven't tried that approach.