BMG’s adult music division, The RCA Victor Group, has signed the contemporary instrumental supergroup Fourplay to the Bluebird label. Fourplay-Bob James (keyboards), Nathan East (bass), Harvey Mason (drums) and Larry Carlton (guitar)-are currently recording a new album to be released in summer 2002 and followed by a world tour. Together and individually, Fourplay have been at the top of the pop, rock and jazz charts for the past three decades, earning an international reputation as "America’ …