Which recording artist released its fourth studio album, titled Ether, which featured a guest appearance from singer, songwriter and rapper CeeLo Green?
Ether (B.o.B album): Ether is the fourth studio album by American hip hop recording artist B.o.B. CeeLo Green: Thomas DeCarlo Callaway (born May 30, 1975), better known by his stage name CeeLo Green (sometimes rendered as Cee Lo Green), is an American singer, songwriter, rapper, record producer and actor.
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