Conversation so far:
What year did REO Speedwagon achieve mainstream success?
On November 21, 1980, Epic released REO Speedwagon's Hi Infidelity, which represented a change in sound, going from hard rock to more pop-oriented material.
What was REO Speedwagon's first popular track?
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“
Did t REO Speedwagongo on tour following their mainstream success?
REO Speedwagon toured the US in 1985
Was the REO Speedwagon US tour in 1985 successful?
Yes REO Speedwagon's tour including a sold-out concert in Madison, Wisconsin in May.

Question: Which album make them popular?
Self-contained rewrite: Which album made REO Speedwagon popular?