Digital Music
I believe that the sampling rate of digital music is high enough that most people cannot hear the difference between digital and analog.
Theoretically, the human ear's sampling rate is far smaller than the sampling rate on CDs. However, this does not necessarily mean that people cannot hear the difference between digital and audio for a couple of reasons:
1. Analog does seem warmer. The digital cliffs can align with the wave that the ear is picking up and thus be detected.
2. Analog does have distortion as it is turned up. This distortion might add to the perceived "warm" qualities.
