Do you have any music that you've found sounded worse as your hi-fi has improved?
For me, the best example is IT Bites' 'Calling all the heros'. In my youth it was one of my favourite tracks. However, as my hi-fi improved I started to hear more details, and for me one thing in particular started to become evident. The awful drumming. It's all over the place. On the cheap equipment I used to use, the drumming disappeared into the general mix, but as my equipment improved, the instruments separated and out of the amorphous mass stepped that drumming.