Sorry, but class A is most definitely the ideal form of audio amplification.
I completely disagree. As I have said before, beauty is in the eye of the beholder. A full "FET Class A" amp will sound different than a "Bipolar Class A" amp and will sound different than a standard "Class AB" amp, (obviously Class D sounds different as well). They all introduce a different sonic signature to the mix. Personally, I have not heard any full Class A amp that I really liked, but many others love them for the full/round and warm sound - or liquidy if you are looking at a bipolar Class A circuit.