CREATE TABLE table_6755 ("Version" TEXT, "Length" TEXT, "Album" TEXT, "Remixed by" TEXT, "Year" FLOAT)

What year was Mother's Live remix created?
SELECT SUM("Year") FROM table_6755 WHERE "Version" = 'mother''s live remix'
SELECT SUM("Year") FROM "table_6755" WHERE "Version" = 'mother\'s live remix'