Music during Sanfermin is, above all, Brass-band music (rass bands that you meet up with all over the streets of the old part of town). That is to say, the typical loud wind instruments and the big drum.This is the music of the "Peñas". When you come, you will get an overdose of this continual "Thump-thump" beat. Even days after the Fiesta is over, you will have that sound echoing round your head.
The hymns of the "Peñas" are the best pieces from this limited "repertoire" of the brass bands. They play them day and night at all hours and in all sorts of places, but mainly in the street But they are at their most characteristic during the bull-fights and immediately afterwards when they parade out of the ring. All the old traditional tunes of Sanfermin are of a similar style: the riau-riau, the ice-box cart, the squad gets up, the boss is a bollocks, etc. This music is bellowed out without inhibitions.