Conversation so far:
Who are the quartets?
From 1971 to 1976, Jarrett added saxophonist Dewey Redman to the existing trio with Haden and Motian.
What was their roles in the quartets?
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The so-called "American quartet" was often supplemented by an extra percussionist, such as Danny Johnson, Guilherme Franco, or Airto Moreira, and occasionally by guitarist Sam Brown.

Question: What performances they did in 1970s?
Self-contained rewrite: What performances the Keith Jarrett's quartets do in 1970s?