Este é O pardal (1996) de Mary Doria Russell.
In 2019, humanity finally finds proof of extraterrestrial life when a listening post in Puerto Rico picks up exquisite singing from a planet that will come to be known as Rakhat. While United Nations diplomats endlessly debate a possible first contact mission, the Society of Jesus quietly organizes an eight-person scientific expedition of its own. What the Jesuits find is a world so beyond comprehension that it will lead them to question what it means to be "human".
De resumo detalhado do enredo da Wikipedia :
Sandoz becomes a slave/pet of a famed poet-songwriter, whose broadcasts first alerted Earth to Rakhat's existence. Sandoz is physically disfigured. [...] The flesh between Sandoz's metacarpal bones is cut away to make it seem that he has long elegant fingers like the hasta'akala plant (which grows on a stronger tree and is thus dependent). The disfiguration starts at Sandoz' wrists, and with which he cannot even feed himself. [...] It is later revealed the songs which Sandoz had originally considered to be a divine revelation are in fact a kind of ballad pornography celebrating rape, relating the songwriter's sexual exploits on broadcast to the populace.