Conversation so far:
What were the Duet projects involving Chick Corea?
In the 1970s Corea started working with vibraphonist Gary Burton. Toward the end of the 1970s, Chick Corea embarked on a series of concerts and two albums with Herbie Hancock.
What songs did Gary Burton and Herbie Hancock play together?
Chick Corea and Herbie Hancock traded playing each other's compositions, as well as pieces by other composers such as Béla Bartók.

Question: What came of the duets?
Self-contained rewrite: What came of the duets between Chick Corea and Herbie Hancock?