Conversation so far:
What happened in the 1970s to El Gran Combo de Puerto Rico?
In 1970, El Gran Combo's contract with Gema Records was not renewed.
What did El Gran Combo do after their Gema Records contract was not renewed?
The group decided to self-release recordings under their own newly created independent label, Combo Records.
Were El Gran Combo successful under Combo Records?
In 1970 they released their first album on the label.

Question: What did they release under Combo Records?
Self-contained rewrite: What did El Grand Combo release under Combo Records?