Queen were the first act to have all four members write a song that became a Top Ten hit for the band. What was the title of the hit that created the feat?
I interpreted the question in the same way as the first two posters, in which case Roger Taylor's Radio Ga Ga is indeed the right answer, but just in case - the first Top 10 hit that all four members had a hand in writing was 1981's Under Pressure, written and performed by Queen and David Bowie. The first one written by all four members and nobody else was One Vision in 1985.