What do three singing pigs say?

On Friday, Mommy bought Briana a new book. The book is "Moo, Baa, La La La" by Sandra Boynton. Briana likes the book, and caught on to it very quickly. The first three pages of the book read as follows:

"The cow says MOO!"

"The sheep says BAA!"

Three singing pigs say LA LA LA!"

Here's Briana's recount of the book: