The far-flung musical friendship of Zieti, a daughter’s tribute to artist Amalie Rothschild, and ‘World of Warcraft’ designer Greg Street

Summary: This week (08.17.12 & 08.18.12) on The Signal: The story of Zieti, a musical friendship between two Americans and two West Africans; a daughter’s tribute to artist Amalie Rothschild; and a conversation with World of Warcraft designer Greg Street.