I wasn't expecting much, but the handmade melodies actually calm my toddler down within minutes. The instrumental tracks without any singing are perfect for bedtime since there are no lyrics to distract him.
The nature sounds woven into the melodies are what sold me — my daughter's room now feels like a little meadow at bedtime. It's instrumental only, so there are no voices to keep her awake, and she's out within about ten minutes.