CREATE TABLE table_12681 ("Year" FLOAT, "Award Ceremony" TEXT, "Category" TEXT, "Nominee" TEXT, "Result" TEXT)

Which Year has a Nominee of stephen sondheim, and a Category of the best original score?
SELECT "Year" FROM table_12681 WHERE "Nominee" = 'stephen sondheim' AND "Category" = 'best original score'
SELECT "Year" FROM "table_12681" WHERE "Category" = 'best original score' AND "Nominee" = 'stephen sondheim'