A work written by Astor Piazzolla in 1979 for violinist Fernando Suárez Paz. Suárez Paz was the violinist of Piazzolla's late quintet, and this piece is imbued with the charm of tango violin.

The 'shark' in the title of the piece refers to Piazzolla's hobby of shark fishing. In Argentina, fishing for small sturgeon and similar species is popular and widely enjoyed as a sport.

The piece opens with a powerful five-beat rhythm. While the basic beat progresses in two-bar units in 4/4 time, the unpredictable developments, such as sudden rhythmic changes and unexpected two-beat rests, are precisely like the unpredictable movements of a shark. The thrill and dynamism of shark fishing are brilliantly expressed through the wild rhythm and melody.

It is noteworthy that tango was originally music for dancing, and unlike classical music, it did not develop primarily for concert listening. However, this piece features intense rhythmic changes, making it difficult to categorize as music for dancing. This is where Piazzolla's reputation as the 'revolutionary of tango' stems from. As mentioned earlier, tango originated around 1870 among immigrants working in Buenos Aires as dance music, primarily performed as accompaniment for dancing in nightclubs and dance halls.

However, with Piazzolla's emergence, the history of 'tango music for dancing' underwent a complete transformation. He studied under Ginastera, a master of the Argentine classical music scene, and went to Paris to study with Nadia Boulanger, acquiring classical music theory such as fugue. Furthermore, during his time in America, he eagerly absorbed new musical elements such as jazz and rock improvisation and powerful beats, injecting a fresh spirit into tango. Piazzolla's innovative musical endeavors faced fierce criticism from his contemporaries, but he disregarded it, aiming for greater heights in tango and refining his own music to a higher level of perfection. And his tireless challenge and passion for tango elevated it from 'mere accompaniment for dancing' to 'music of superior artistic merit for listening.' Perhaps enjoying this piece while keeping these thoughts in mind might add to the experience.