Judas Priest released their second album Sad Wings Of Destiny in 1975, which contained the track "Tyrant." The track made its way in and out of the band's live rotation up to 1983 and then disappeared. Now a lucky audience in San Antonio, Texas got to hear the song played live for the first time in 35 years, and unsurprisingly the band absolutely crushed it.
The San Antonio date was also the final date in Judas Priest's Firepower tour, so it makes sense they'd close out with something special.