Question: Which band, Marianas Trench or Car Seat Headrest, signed to Matador Records in 2015?
Sentence (from "Car Seat Headrest"): Begun as a solo recording project in 2010 by Will Barnes (born August 23, 1992), known professionally as Will Toledo, Car Seat Headrest released 12 albums on the music platform Bandcamp.
Relevant evidence: No