I wish we could play this to you so you could hear it. It's not one of those endless tuneless toys, this is a Gisela Graham Music Box, carefully designed and created to meet an extremely high-quality product.
The Music Box Christmas Tree is approximately 6in (11.5cm) in diameter and about the same height, so smallish. But the build quality and attention to detail is first-rate.
The tune played is We Wish You a Merry Christmas and is charming as are so many of Gisela's Christmas Decorations.