Which artist has the highest-grossing Las Vegas residency?
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In the '80s, Cher called Las Vegas residencies an "elephant graveyard where talent goes to die." These days, the Strip is a full-blown cash machine, with U2, Lady Gaga, and Katy Perry all planting flags in Sin City (even Cher went back in 2008). Which artist holds the record for the highest-grossing Las Vegas residency of all time?
