"Into the Void" is a song by Black Sabbath, released in 1971 on their album, Master of Reality. An early version of "Into the Void" called "Spanish Sid" was released on the deluxe edition ofMaster of Reality. It is written in the key of C# minor. Various artists have covered the song, including Kyuss, Sleep, Dr. Know, Cavity, Exhorder, Lumsk, Soundgarden, Melvins, Monster Magnet, and Orange Goblin.[citation needed]