Conversation so far:
What accounted for the mainstream success of REO Speedwagon?
On November 21, 1980, Epic released Hi Infidelity, which represented REO Speedwagon's change in sound, going from hard rock to more pop-oriented material.

Question: Major achievements during this period?
Self-contained rewrite: Major achievements during this period after November 21, 1980, when Epic released Hi Infidelity by REO Speedwagon?