Conversation so far:
What happened to Pantera in 1986?
The years 1986 and 1987 saw the release of several landmark thrash metal albums that would prove influential to Pantera's developing musical style.
What were some of the landmark thrash metal albums that were influential to Pantera's music style?
Among the most prominent of these influential albums were Metallica's Master of Puppets, Slayer's Reign in Blood, Anthrax's Among the Living and Megadeth's Peace Sells... but Who's Buying?

Question: When was Anselmo's introduction?
Self-contained rewrite: When was Phil Anselmo's introduction to Pantera?