"Ellens dritter Gesang" (cycle "Die Fraülein vom
See"), op. 52, D.839 , a composition by Franz Schubert
also very well known as "Ave Maria". (Wikipedia)
The pan flute, also known as the syrinx, is an ancient musical instrument made up of multiple tubes of different lengths aligned side by side. This instrument belongs to the woodwind family and produces sound when the player blows across the opening of each tube.