Conversation so far:
Who left Vampire Weekend?
It was revealed on January 26, 2016 that Rostam Batmanglij had departed from Vampire Weekend.
Why did Batmanglij leave Vampire Weekend?
Batmanglij announced on Twitter that he had left Vampire Weekend to pursue solo projects.
What did Batmanglij want?
What did Batmanglij move onto from Vampire Weekend?
Batmangkij moved onto solo projects after leaving Vampire Weekend.
When was it released?

Question: What did they do
Self-contained rewrite: What did Vampire Weekend do?