The txistu (flute) and the tambourine are the usual instruments used to provide the music for the brokel-dantza. Txistu and tambourine are a Basque version of the pipe and tabor duo traditionally used in numerous European regions. In the 17th and 18th centuries, the txistu underwent a unique development in Euskal Herria. An attempt was made to standardise it to more cultured musical forms, by changing the dimensions of the instrument until it was brought in line to the scale of the chamber orchestra of the period. The result of this change was precisely the step that was given to complete the instrumental family of the txistu with the creation of the four-member txistularis group. In that quartet, two people played the txistu and the tambourine, a third person played a longer txistu called a silbote and the fourth played the atabal or drum. Nonetheless, the simple formula consisting of one person playing both instruments that more effectively helped to spread the txistu and tambourine continues to be popular. This type of txistularis have frequently played together with an atabalari. The two aforementioned options - a duo of txistulari and atabalari, and quartert - are suitable for providing the music for the brokel-dantza.
The Elgoibar Txistularis Municipal Band is currently entrusted with playing the music for the soka-dantza
on San Bartolomé's Day. Conducted by José Ignacio Sarasúa, the txistularis have been performing scores arranged by José Ignacio Ansorena since 1991.