I was there, section 102 just to the right of the stage--they had all (most) of the graduates sitting in the lower level, some on the field--During Hartzell's final speech before the grads all filed out, they played a subtle and faint version of "The Eyes" and I told my wife if that is what they consider playing the school song I am gonna be pissed. They never did "officially" announce "and now, The Eyes of Texas" like Wally or Bob Cole do at football games--but asked everyone to stand. "The Eyes" began to play, and it was still pretty dark with only the scoreboard ribbon and jumbotron providing light. I had heard about the walk out and searched around, and mainly noticed the doctoral and grad school candidates on the field leaving. Hard to tell if some of the undergrads did as well, since it was pretty dark. My son, an engineering grad, said a person "of color" booed behind him while it was being played but he was not in graduate cap & gown. Still felt like they were trying to slide the song in without much fanfare to me though...