CREATE TABLE table_20310 ("Week #" TEXT, "Theme" TEXT, "Song choice" TEXT, "Original artist" TEXT, "Order #" TEXT, "Result" TEXT)

Who was the original artist when the theme was 1980s?
SELECT "Original artist" FROM table_20310 WHERE "Theme" = '1980s'
SELECT "Original artist" FROM "table_20310" WHERE "Theme" = '1980s'