Europe

Originally a progressive rock group, Europe didn't achieve any success until they reworked their sound into a bombastic yet melodic pop-metal.
In their first incarnation, the Swedish band was called Force. The band -- featuring core members Joey Tempest (vocals), John Norum (guitar), and John Leven (bass) -- won a national talent contest in the early '80s, which led to a record contract.
After changing their name to Europe and releasing two albums in Sweden (Europe and Wings of Tomorrow), the band landed an international deal with Epic Records. By this time, Norum had left the group and was replaced by Kee Marcello; drummer Ian Haughland and keyboardist Michael Michaeli also joined the lineup.
In 1986, Europe released The Final Countdown. On the album, Michaeli's keyboards took a prominent role (they provide the main riff in the hit title track), which nicely complimented the band's smoother pop melodies.