James Henry Mapleson,
The Mapleson Memoirs, 1848-1888…
“ But in Italy, I regret to say, the practice is only too common for singers to treat conductors as though they were not their directors, but their subordinates. A popular tenor or prima donna receives a much larger salary than an ordinary conductor—or for that matter a first-rate one; and a favourite vocalist at the end of the season often makes a present to the maestro to reward him for not having objected to some effective note or cadenza which is out of place, but which the "artist" is in the habit of introducing with a view to some special effect. ”
