The song is considered to have been influential on the development of the doom metal subgenre. In his 2020 book
Doomed to Fail, author
JJ Anselmi said "Doom metal has been delivering that sweet, sloth-paced sense of impending death and destruction since the very first, terrifying tri-tone at the beginning of 'Black Sabbath,' the track that kicked off the eponymous Black Sabbath record in 1970." Nick Ruskell of
Kerrang! said "with this opening throw from their self-titled debut, Sabbath can be credited with not only drawing the line in the sand between heavy rock and the newer, more sinister sound of metal, but also defined a shadowy corner of it that would slowly bloom over the next half a century. The bell, the tritone, the trill, the tempo, Satan coming round the bend – it would inspire a thousand doom bands, but none would ever manage to be quite so doom as this." According to
Classic Rock Magazine in 2021: "If you ever come across anyone who’s never heard a note of metal music, and they ask you explain it to them, just sit them down, turn up the volume and play the song 'Black Sabbath,' because this is the definition of the genre. Nothing else need be said or added. The whole of metal is contained in this one remarkable track. Everything since has been based on what Black Sabbath did here. [...] t’s the opening track on the first album by the forefathers of metal." In 2021, Eli Enis of
Revolver included the song in his list of the "15 Greatest Album-Opening Songs in Metal". ==Music video==