Selection and evolution: describe question

In a population of birds on an island, a mutation causes some males to produce higher-pitched courtship songs than the ancestral lower-pitched song. Females are known to prefer the song type they heard from their father during a critical early learning period. Over time, the population splits into two groups that rarely interbreed, even though they occupy the same geographical area. Describe how this behavioural difference can lead to the formation of a new species via sympatric speciation.