CREATE TABLE table_2460 ("#" FLOAT, "Japanese title" TEXT, "R\\u014dmaji" TEXT, "Japanese translation" TEXT, "Vocalist" TEXT, "Episodes used" TEXT)

When momoiro clover z is the vocalist how many japanese titles are there?
SELECT COUNT("Japanese title") FROM table_2460 WHERE "Vocalist" = 'Momoiro Clover Z'
SELECT COUNT("Japanese title") FROM "table_2460" WHERE "Vocalist" = 'Momoiro Clover Z'