Horacio Pettorossi, born Gemignani Pettorossi on October 21, 1896, in Buenos Aires, Argentina, was a renowned guitarist, composer, and bandleader, affectionately nicknamed "El Marqués." Pettorossi's musical journey began at the tender age of five when he started playing the guitar. After completing grade school, he dedicated himself entirely to mastering the instrument. To support his family and pursue his passion without guilt, he worked for Avelino Cabezas and at the post office.

Pettorossi's talent soon caught the attention of his peers, leading to his inclusion in a group of twenty guitarists by José Ricardo for a performance in the play "Juan Moreira" in 1915. During this time, he became acquainted with the legendary Carlos Gardel. In 1916, Pettorossi joined José Podestá's theater company, where he accompanied the prominent singer Ignacio Corsini and the duo Las Chilenas, later known as Las Porteñas.

Throughout his career, Pettorossi composed several notable tangos, including "Fea," "Galleguita," and "Torcacita," with lyrics by Alfredo Navarrine. These songs were recorded by Corsini and Gardel in the early 1920s. His instrumental compositions, such as "Pico de oro," "El correntino," and "La Ñatita," were also well-received.

Pettorossi formed various musical groups, including Los de la Leyenda and Los de la Raza, the latter of which toured Europe extensively. His European ventures included performances in Spain and Germany, and he later traveled to France, where tango was gaining popularity. There, he collaborated with musicians like Eduardo Bianco and Bachicha.

Horacio Pettorossi's contributions to tango and his collaborations with prominent artists of his time left a lasting impact on the genre. He passed away on December 25, 1960, leaving behind a rich legacy of music that continues to be celebrated.