CREATE TABLE table_17267 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Musical guest and song" TEXT, "Original air date" TEXT, "Production code" TEXT)

How many musical guests and songs were in episodes with a production code k0519?
SELECT COUNT("Musical guest and song") FROM table_17267 WHERE "Production code" = 'K0519'
SELECT COUNT("Musical guest and song") FROM "table_17267" WHERE "Production code" = 'K0519'