You know a Hermit Thrushes' song, but how well have you really heard it?

All of us have heard the beautiful sound of a Hermit Thrush singing, but how well have you really heard it? As some of you know, I don't have any high frequency hearing and have to use a "birder's hearing aid" to hear most birds, except those with very low voices. But I love the sound of a Hermit Thrush, even with the "Songfinder", and I often stop just to listen to them. On occasion I have sat so long I've dozed off, only to wake with the birds still singing.
My hearing aid works by reducing the frequency of the high frequency sounds by half, 1, 2 or 4 times, but I never have to set it for more  than 1. It doesn't affect the "normal" lower frequencies. But sometimes, like today, I have noticed that some of the choruses of the thrush are so high that I hear them as squeaky and "small", even with the aid. With or without, when I hear that I know the sound is at or above the upper limit or my hearing.
So today I tried an experiment; I set the aid up a notch to 2.  And to my amazement, I discovered that a few times the songs went so high I had trouble hearing them! When I pushed it to 4 I could finally hear the entire song, but that is almost unimaginably high! Only someone with very seriously impaired hearing or almost deaf would need to use that setting.
And that makes me wonder if the vast majority of people can ever really hear that song. I believe it would require very exceptional hearing such as they say young children have. I know a few birders whose hearing is exceptional and perhaps they share that gift, but I'm guessing most of us just don't. I'd love to know what others think and what they can hear.