Some of the light-hearted songs require the singer to emit a weird, guttural  ye-ye-ye  sound.
The singers need to practice many years to achieve the correct gut sound that is weird. 
mnli hypothesis: The singers need to practice many years to achieve the correct gut sound that is weird.  premise: Some of the light-hearted songs require the singer to emit a weird, guttural  ye-ye-ye  sound.