Barcelona's free-jazz band BAF appeared in the 8th edition of the San Sebastian Jazz Festival. This audio document shows their performance that took place in the Plaza de la Trinidad of San Sebastian (Spain), in the evening of July 23, 1973. For that time, Baf was formed by Julio Llorens (pocket trumpet), Jordi Marti (flute), Ramon Sole (electric guitar), Enric Cervera (double-bass), and Marti Soler (percussion).
More info at: http://jacktorrance-overlookhotel.blogspot.com/2011/01/baf-en-el-viii-festival-de-jazz-de-san.html