Arthur Edward Johnstone,
Instruments of the Modern Symphony Orchestra…
(1917)
“ Of the wind instruments it has often been said that the slide trombone excels all others in accuracy of intonation, and in this respect is unique in being the equal of the stringed instruments. This statement must not be taken too literally. An artist possessing a fine instrument—be it woodwind or brass with valves—can play perfectly in tune by delicate regulation of lip tension and manner of blowing. Thus all good instruments are susceptible of being played in tune if the player is skilled and his ear is perfect. ”
