Daughter‘s 30th birthday present. Help needed.

Hi everyone, this is quite vague, but I would like to buy my daughter a music box for her 30th. No problem with that, there are loads to choose from. However, my daughter has written and produced musicals....just for pleasure, but it is her passion. I would love to put one of her own songs on the music box. Does anyone know how I may be able to do this? Perhaps you’re someone who makes them to order. I would love to hear any suggestions. Thank you.