Have you seen the paper by Anica Arsic entitled: "Achievement Identification and Evaluation of Musically Gifted Children in Lower Music School"? if not, it can be found by searching for the following DOI: 10.17810/2015.20
If I have copied it right, a direct link is: https://files.eric.ed.gov/fulltext/EJ1149395.pdf
First; why would you like to do that? Let children be children, talent will show in due time if school gives opportunities to musical expression. Do not force elitistic agendas all the way down in preschool.