Among his followers, the composer and pianist Fernando Otero and Piazzolla's protégé, bandoneonist Marcelo Nisinman, are the best known innovators of the tango music of the new millennium, while Pablo Ziegler, pianist with Piazzolla's second quintet, has assumed the role of principal custodian of "nuevo tango", extending the jazz influence in the style. The Brazilian guitarist Sergio Assad has also experimented with folk-derived, complex virtuoso compositions that show Piazzolla's structural influence while steering clear of tango sounds; and Osvaldo Golijov has acknowledged Piazzolla as perhaps the greatest influence on his globally oriented, eclectic compositions for classical and klezmer performers.