CREATE TABLE table_15438 ("Week" TEXT, "Theme" TEXT, "Song choice" TEXT, "Original artist" TEXT, "Result" TEXT)

What was the theme for Vegas Verdicts week with a result of Advanced?
SELECT "Theme" FROM table_15438 WHERE "Result" = 'advanced' AND "Week" = 'vegas verdicts'
SELECT "Theme" FROM "table_15438" WHERE "Result" = 'advanced' AND "Week" = 'vegas verdicts'