The Still Small Voice of Trumpets by Lloyd Biggle, Jr.
Paperback. Condition: Very Good. 1968. Leisure books.
Book #1 in the Cultural Survey Duology.
Interplanetary agent Jef Forzon's mission was to touch off a democratic revolution among the oppressed and brutalized people of the planet Kurr. The ruler of Kurr, King Rovva, had so brilliantly controlled his people, through a mixture of torture and kindness, that few were ready to follow young Forzon, and many were ready to betray him.Alone, with a price on his head, Forzon must find a means to "turn on" this music-loving people before it was too late.