Carrillo

Here's a new site (in Spanish), with sound files, texts, and photodocumentation about the Mexican composer Julián Carrillo, whose work was largely microtonal ("El Sonido 13"— the "13th sound") , often requiring the construction of new instruments.  

It's interesting that Mexico produced three important pioneers in musical tuning systems: Carrillo, Augusto Novaro (about whose work too little is known), and Ervin Wilson, with whom I was fortunate to start studying while in High School.