Daniel Terrazas, who plans to become a music educator, worked with and gold- and platinum-record winner Graciela Beltrán during a recent three-day tour in Oklahoma. The music major at California State University, Dominguez Hills works part time in the Los Angeles area playing the tuba for Mexican folk groups. One of the promoters for these groups offered Terrazas the opportunity to play for the widely popular singer, and he took the job to get a higher level of professional experience under his belt.