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In page Joanne Catherall:

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After the tour, Catherall and Sulley returned to school full-time while Wright and Oakey set about composing and songwriting.[citation needed] The new Human League of Sulley, Oakey, Catherall and Wright started to gain ground in early 1981 with the release of the single "Boys and Girls". Although it charted only at number 48, it was the most successful single at that point. The girls were not used in the production, as the song was written without any female backing, and they were busy with school, however they were featured on the record sleeve and in promotional photo shoots.