I have always loved lullabies. They're my absolute favorite to sing, write and play. I recommend picking one special lullaby to sing to your child over and over again throughout their childhood (recordings are okay, too, but live singing from a parent is the very best, according to music therapy research). For my daughter, that lullaby was a version of "Stay Awake" from Mary Poppins. My daughter was so used to that song as a "cue" for sleep that to this day, she yawns right when I sing the first few notes.