Conversation so far:
What was Corea's original music style?
In the early 1970s, Corea took a profound stylistic turn from avant-garde to a crossover jazz fusion style.
What was the new style Corea switched to during the early 1970s?
a crossover jazz fusion style that incorporated Latin jazz.
What album first featured Corea's new style?
Return to Forever.

Question: When was Return to Forever released?
Self-contained rewrite: When was Corea's album Return to Forever released?