Led Zeppelin were pretty popular. Though often pigeonholed as a "Hard Rock" band, their music was fairly eclectic, touching on elements of blues, folk and psychedelia. Still, they are mostly remembered as being loud and bombastic and one of the forebears of what would come to be known as Heavy Metal. Their eponymous first album predates Sabbath's debut by a full  year and the sludgy tempo of their version of Jake Holmes' "Dazed and Confused" is as legit a ground zero as any.  

 

 

Spotify Playlist: 

https://open.spotify.com/playlist/2qkURdYib8hLz8s20D9yTC?si=1526168526854a62