Nothing unusual about releasing an album by an artist after he or she is dead. But here’s a new low – a “duet” by two stars, mixed after they’ve both died. “Both Marley and Notorious BIG were used to pushing the musical envelope while alive, but this effort would still have surprised them. I know I scratched my head wondering why anyone would risk the reputations of two of the industry’s most influential artists for this ghoulish effort. The guilty parties, of course, are the late artists’ estates…”