From my understanding, 44.1 kHz, 16-bit audio covers the range of human hearing. What I found IS important about HDCDs is when peak extension is enabled, which essentially hides the more dynamic master behind that HDCD layer. Some examples of albums that have this include
Car Wheels on a Gravel Road by Lucinda Williams (though it isn't labelled as an HDCD; it is one), The Cars' self-titled album,
Moon Pix by Cat Power, The Chicks' (formerly The Dixie Chicks)
Fly and
Wide Open Spaces, a few Joni Mitchell albums, and much of Neil Young's CD catalog. More examples can be found
here.
I don't see Neil Young's
Greatest Hits listed, but if I had to guess, it probably has peak extension enabled.
View attachment 104368
Oh, and you can decode the peak extension part with an add-on to the program Foobar2000.