Conversation so far:
When did Ray come out?
2004.
Was Unpredictable a movie?
Foxx released his second studio album, Unpredictable.
What film did Foxx win an award for?
Ray.
What category did he win?
he won the Academy Award for Best Actor and the BAFTA Award for Best Actor in a Leading Role.
When was Dreamgirls released?
CANNOTANSWER.

Question: What was his most successful project during this time?
Self-contained rewrite: What was Jamie Foxx's most successful project?