Saint Vitus and Pentagram had what in common when it came to the music industry?
Saint Vitus (band):  They are one of the first doom metal bands, alongside Pentagram, Witchfinder General, Trouble and Pagan Altar. Pentagram (band): Pentagram is an American heavy metal band from Alexandria, Virginia, most famous as one of the pioneers of heavy metal, and the subgenre of doom metal in particular.
They are one of the first doom metal bands