Bordun (m)
only drone, adjustable: cylindrical, bent, bell, no cavity / single reed
Starting retrograde, it bends down immediately behind the back.
Acoustic length: 810-985 mm (E♭, D [Pitches mentioned by Sobieski]); Its entire external [= absolute] length (➺ Absolute / Relative length), including ox-horn extension and Kielich, is 1590 mm.
NB: Example(s) to be replaced with staff-notation.
Sobiescy, Jadwiga [Pietruszyńska] & Marian: Polska muzyka ludowa i jej problemy [Polish folk music and its problems]. Wybór prac pod redakcją Ludwika Bielawskiego [A selection of their works edited by Ludwik Bielawski]. Warszawa, 1973, p.115, 118 (measures), 155 (pitches).
Leydi, Roberto: La zampogna in Europa. Como, 1979, p.149 (type only, no term).