During the two-part singing and Pplaying in the Istrian scale the singers are accompanied by musicians playing traditional woodwind instruments, most often two sopile (also called roženice), which are long wooden horns similar to oboes. A larger sopile, referred to as the “male” and of lower pitch, is accompanied by a smaller, “female” sopile. Other instruments may include a flute, a smaller, higher-pitched fife, and bagpipes made from animal skins. Tambura string instruments may also form part of the ensemble. Two-part singing and playing in the Istrian scale has distinct characteristics, including its use of non-tempered tonal intervals.