Rock a Bye Baby is an example of a lullaby.
Singing-Whether you sit in a rocking chair or lightly pat your baby while she lies in her crib, a lullaby is the perfect ending to a busy day for you and baby.
Don't get caught in his lullaby, because he will put you to sleep... and then beat the tar out of you.
I find songs like "Beauty in the Breakdown" (their first song) or "Call It a Lullaby" to be among their weakest moments.
If you don't touch your remote for an extended period of time, your Mii will go to sleep and the music turns into a sweet little lullaby that you might even take a nap to yourself.