Conversation so far:
What album did they release in1976?
Black Market.
What was the music style on the album?
melody-oriented, concise forms, which also offered a greater mass-market appeal.
did the band stay together during this time?
Prior to his departure, Johnson played on all but two of the new album's tracks.

Question: Who was his replacement?
Self-contained rewrite: Who was Johnson's replacement after he departed from the band Weather Report?