"Pick a song that you can stand to sing over and over, maybe for years," is advice that Elizabeth Wolf of Merrimac, Mass., gives new parents. "Doesn't matter how well you sing it. Over time that will ...

Jennifer Hsu Larratt-Smith of Riverside, Calif., also feels a generational connection from a family lullaby. "I am second-generation Chinese American, and my dad would sing this lullaby to me every ...