I've seen many YouTube videos showing random things that make babies stop crying. Hair dryers, running faucets, vacuum cleaners, etc. Mazzy used to stop crying when I sang "You Are My Sunshine" but that stage is long over.
Plus "You Are My Sunshine" makes Mazzy seem incredibly lame when you consider the baby below. This kid stops crying when she hears the vocal stylings of one Notorious B.I.G. singing— what else? "Hypnotize".
That's right. Biggie Smalls can quiet the kiddies from the grave.