In 1972, Joe Ortiz hosted a radio show at KLOS-FM in Los Angeles, and interviewed members of Chicano rock legends TIERRA, YAQUI and Mark Guerrero and discussed how their music has evolved. This interview was recently found and has been posted on Joe's blog, "It Seems to Me." http://itseemstomebyjoeortiz.blogspot.com/2011/08/rare-tape-of-radio-show-on-evolution-of.html?spref=gb