I suffer from tinnitus, and hearing loss in both ears from too much loud music. But, I'm lucky, because, although I hear it all the time, it isn't so bad that it interferes with my sleep, my enjoyment of CDs and guitar playing, and life in general. And, that's not true for many that suffer from the same affliction. And, I'm lucky in that, although my left ear is worse than my right, when I listen to music on my stereo, or on my computer, things that should be in the center, including high pitched sounds like cymbals, still sound perfectly centered. I wear earplugs all the time, because it seems to reduce the effect of the ringing, but also because it keeps my guitar playing and music listening from exacerbating the ringing. I do find that if I play with my amp too loud or my stereo too loud, then the ringing will be worse afterwards. This is one reason that I use small practice and/or modeling amps, and stereo speakers, that sound full and rich at low volume levels, because I don't want to continue to damage my ears more than I have to. So, to make a short story long, what I'm trying to say is, protect your ears, because, besides your hands and your mind, they are your most important asset as a musician, and you don't want to become the next Beethoven. Anytime your ears are ringing after a concert, stereo session, or jam session or rehearsal, you're doing damage. Use some kind of hearing protection, even if it's only cotton or toilet paper stuffed in your ears. Anything is better than nothing, and turning down is better still. One of the reasons that my left ear is worse than the right is because it was 3 feet from the drummer's crash cymbal in the tiny garage that we used to jam in. And, I have to cover my ears if I'm on the street and an ambulance goes by me. If I don't, it's physically painful to me. At my age, some loss of high frequencies is to be expected. Most men above 50 don't hear anything above 15khz, while young people can hear out to 22khz. I'm lucky that my high frequency loss isn't worse than it is, because I just tested myself with an online generator, and, even with my cheap Logitech speakers with no tweeter, I could still hear the 10khz tone, but not the 11khz one, although at a reduced level. I had to turn the volume up to hear the tones above 6khz, compared to 6khz and below. But, after that, my ears are screaming now more than usual. So, be forewarned, because our hearing is something we take for granted until we lose some of it, and then we realize we should have been more careful.