Conversation so far:
What does Rocka Rolla refer to?
Rocka Rolla is the debut single by British rock band Judas Priest, first released in August 1974
Who produced Judas Priest's debut single?
Judas Priest went into the studio in June–July 1974 with Black Sabbath producer Rodger Bain.

Question: What album did Rocka Rolla appear on?
Self-contained rewrite: What Judas Priest album did Rocka Rolla appear on?