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.
What Judas Priest album did Rocka Rolla appear on?
Judas Priest released their debut single Rocka Rolla that August and followed in September with an album of the same name.

Question: What was the style of the album?
Self-contained rewrite: What was the style of the first Judas Priest album?