Don Osvaldo

Don Osvaldo is an Argentine rock band formed in November 2010, when Patricio Santos Fontanet changed the name of Callejeros, after their official separation on November 12. The band was first called Casi Justicia Social, also known as CJS (by their initials, which abbreviated the name Callejeros). However, on September 29, 2014, it was announced that the group would change its name to the current one in homage to Osvaldo Pugliese.