CREATE TABLE table_28495 ("Week #" CLOB, "Theme" CLOB, "Song choice" CLOB, "Original artist" CLOB, "Order #" CLOB, "Result" CLOB)

Who was the original artist of the group performance theme?
SELECT "Original artist" FROM table_28495 WHERE "Theme" = 'Group Performance'
SELECT "Original artist" FROM "table_28495" WHERE "Theme" = 'Group Performance'