'Vol. 4' saw Black Sabbath beginning to experiment with the heavy sound they had become known for. Although most of the album's songs are in the band's trademark heavy style, others demonstrate a more sensitive approach which the band had never attempted before. The best example of this experimentation can be heard in the song "Changes."
The album cover features a monochrome photograph of Ozzy Osbourne with hands raised, taken during a Black Sabbath concert.
Side A
1 Wheels Of Confusion
2 Tomorrows Dream
3 Changes
4 FX
5 Supernaut
Side B
1 Snowblind
2 Cornucopia
3 Laguna Sunrise
4 St. Vitus Dance
5 Under The Sun