The txistu (Basque pronunciation: [ˈtʃis̺tu]) is a kind of fipple flute that became a symbol for the Basque folk revival. The name may stem from the general Basque word ziztu "to whistle" with palatalisation of the z (cf zalaparta > txalaparta). This three-hole pipe can be played with one hand, leaving the other one free to play a percussion instrument.
Evidence of the txistu first mentioned as such goes back to 1864. Yet it is apparent that it was used earlier, although it is not easy to establish when it started out; actually, it is impossible to do so, the txistu being the result of an evolution of the upright flutes widespread as early as the Late Middle Ages, when minstrels scattered all over the Iberian Peninsula brought in instruments that locals, noblemen first and common people later took on and developed. At the beginning, txistu players (txistularis) were named in romance written records after the tabor (pipe and tabor were played together): tamborer, tamborino, tambolín, tamborín, tamboril, músico tamboril, tamborilero, tamboriltero. However, when named after the flute, they are called in Spanish pífano, silbato, silbo, silbo vizcaíno or chilibistero.
The three-hole flute was no doubt used by people in much of Spain and western Europe not only in the Basque Country, but recordings of Basque names for the instrument turn up later: txilibitu, txirula, txirola, txürula, txulula, txilibitulari, txilibistari. While some instruments fell into decay, from the Renaissance on the three-hole flute raised its profile and increasingly took on the length as we know it today (42 cm) in the western Basque Country. In contrast, the (t)xirula, the version that prevailed on the eastern Basque Country (Soule, Labourd and Navarre) remained shorter in size. At that point, three-hole flutes were made of wood (despite some instances of flutes made in bone).