I purchased two of these stuffed lambs for Easter baskets. They worked well for my 3 yo son and 2 yo nephew. The song plays fine, and the lambs are sufficiently well built and cuddly.
The lamb's music is controlled by a key that is easily usuable by a toddler. The one odd thing is that the key allows you to unscrew it. So if you turn it the wrong way, you'll have to turn it back before it starts cranking.
There is not much to say other than that. This is a music box in the form of a stuffed animal, NOT a stuffed animal with music. So this isn't meant to be played with by a baby or to be someone's carry around toy. It is better suited for being sat up on a shelf and played to help a baby to sleep, or played with your toddler to expose him to the song.
I dropped the rating a star because of the oddity of the key being able to be unscrewed, which can be frustrating when you have to screw it 5 or six turns before it starts winding up. Other than that, treating it more like a music box for kids and less like a stuffed animal would be the key to making sure this is the product for you.