Conversation so far:
Who are the people that influence At the Drive-In?
Some of At the Drive-In's influences are Indian Summer, Swing Kids, Fugazi, Sunny Day Real Estate, Bad Brains, and more.
What is their style of music?
At the Drive-In's style is usually described as post-hardcore.

Question: What type of instruments do they use to play post-hardcore?
Self-contained rewrite: What type of instruments do At the Drive-In use to play post-hardcore music?