Conversation so far:
When was the band The National formed?
The National is an American rock band from Cincinnati, Ohio, formed in 1999.
Did The National perform their album Day of the Dead live?
A Day of the Dead live performance took place in August 2016 .
Did The National do collaborations with other artists?
Day of the Dead by the Nationals features collaborations and recordings from a diverse group of artists.
What is the name of one of The National's songs?
A compilation album titled Dark Was the Night was released by 4AD. The compilation featured a new song by the National and Nico Muhly titled So Far Around the Bend.

Question: Who is 4AD?
Self-contained rewrite: Who is 4AD in relation to the band The National?