Question

at 30:50, an instrumental group enters with a terrifying interjection using a harsh and
asty\ tone at this pivotal moment in the sacrificial dance from stravinskys
ite of spring\. how would you describe the group performing this interjection? trombones with mutes french horns

Explanation:

In Stravinsky's The Rite of Spring, the harsh, biting interjection at the pivotal moment of the Sacrificial Dance is performed by trombones using mutes, which creates the distinct "nasty" and piercing tone described. French horns do not produce this specific harsh, aggressive timbre in this section.

Answer:

trombones with mutes