In "ol time" country (I do not beleive this threads winds through the Alpine regions)A missing elemental piece of this thread's pi.
Obviously, take the last open vowel sylabol of the chorus and repeat with rear-undulation of the tongue against the upper rear molars....moving into falsetto and back.
A - E - I - O - U
Like the circle of fifths/fourths...wherever you begin.... you roll around back to the start.
Sincerely,
Gargoyle