Conversation so far:
What caused the drama?
After the Drama tour.
What happened in 1980?
Downes and Howe opted not to continue with the group and went their own separate ways in December 1980.
Who were they replaced with?
An announcement came from the group's management in March 1981 confirming that Yes no longer existed.
How did the album Drama do on the charts?
CANNOTANSWER.
Did its members form any other bands?
Downes and Howe later reunited to form Asia.

Question: Was there another band formed as well?
Self-contained rewrite: Was there another band formed as well besides Yes?