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?
).
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.
What performances they did in 1970s?
The group recorded two albums for Atlantic Records in 1971, El Juicio (The Judgement) and Birth.
After El Juicio what album they released?
another on Columbia Records called Expectations (that included guitar by Sam Brown.
Was Expectations followed by other performances?
plus string and brass arrangements and for which Jarrett's contract with the label was terminated within a month of its release).
After the termination did they embark on other projects?
Byablue and Bop-Be, albums recorded for Impulse!, mainly feature the compositions of Haden, Motian and Redman.

Question: Did impulse have its followings?
Self-contained rewrite: Did impulse have followings despite involving members of the 1970 quartet ?