Conversation so far:
What happened regarding Utada Hikaru in 2004?
In 2004 Utada Hikaru released her first singles compilation album Utada Hikaru Single Collection Vol. 1 and her North American English-language debut album, Exodus.
was the Utada Hikaru album Exodus successful?
Exodus is the largest debut selling foreign language album in Japanese history (debut with 523,761 units).
when did Utada Hikaru go international?
In 2001, Utada Hikaru appeared on the Rush Hour 2 Soundtrack and on October 5, 2004, Utada Hikaru released her North American English-language debut album, Exodus.

Question: what was exodus?
Self-contained rewrite: what was exodus by Utada Hikaru?