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

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'