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.
Major achievements during this period after November 21, 1980, when Epic released Hi Infidelity by REO Speedwagon?
Hi Infidelity spawned four hit singles, including the chart-topping Keep On Loving You, plus Take It on the Run, In Your Letter, and Don't Let Him Go“
Any awards or recognition during this time for REO Speedwagon's Hi Infidelity album?
Hi Infidelity remained on the charts for 65 weeks, 32 of which were spent in the top ten, including 15 weeks atop the Billboard 200.

Question: How many albums sold?
Self-contained rewrite: How many Hi Infidelity albums by REO Speedwagon sold?