Asia comes to mind. The English Beat migrated in to General Public and Fine Young Cannibals.
Great piece of rock trivia: Blues Image's ("Ride Captain Ride") lead singer became lead singer for Iron Butterfly.
Oh Lord, I hated The Firm! I was a diehard Led Zeppelin fan during this time. I always really enjoyed the bluesy rock of Bad Company. When I heard singer Paul Rodgers would join forces with Jimmy Page, I was ecstatic! A match made in 70s rock Heaven!
The result was soundly disappointing. Page's guitar playing had never sounded worse. (I later learned he was battling many chemical demons throughout the 1980s.) I don't know what they were trying to do short of sending Zeppelin/Company fans into severe depression.
That horrible single "Radioactive" makes me cringe. Great. Now it's stuck in my head.