The insults do not stop:
No professional singer would think of being accompanied on the guitar; and if the instrument maintains its ground in practice at all, it is in consequence of its convenience, of fashion, and above all, of the badness of people’s ears.
General T. Perronet Thompson, Instruction to my Daughter for Playing on the Enharmonic Guitar (1829).
Disguising his polemic as a method book, the General was one of the first in a long line of cranks railing against equal-tempered tuning, a tradition I proudly carry on. More about his tuning system here.