The lyrics are from the point of view of Satan, who falls in love with a woman and he turns out to be a good guy. It begins with a bass solo by Geezer Butler, titled "Bassically" on some US releases as a intro. It involves the use of the wah-wah pedel on his bass and was recorded in one take, as the amp's volume control is audibly turned up before the distorted bass intro of "N.I.B." begins. The song's main riff (as well Osbourne's vocal delivery) have been noted for their Cream-influenced sound — the song has even been referred to as "the raucous defiling of Cream".