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There are two bands with the same name: 1. Japanese J-Pop group "Sphere" 2. Polish Death Metal band "Sphere" 1. Sphere is a Japanese pop idol unit formed by four voice actresses affiliated with Music Ray'n. The group made their major debut in April 2009 under Lantis with the single "Future Stream". Sphere was formed in earlt 2009 by four idol seiyuu managed by Music Ray'n. Even though all members are singed to Sony Music Entertainment, they made their debut in April 2009 under Lantis label with the single "Future Stream" which was used as the opening theme for the anime Hatsukoi Limited.