Tony Iommi on writing metal’s greatest riff: “You never know when the magic’s going to strike”
Tony Iommi says the riff for Black Sabbath’s “Symptom of the Universe” came to him unexpectedly, illustrating how songwriting inspiration can arrive without warning. The piece reflects on the creation of a track often regarded as one of metal’s defining riffs.
Iommi wrote the riff while at home and took it to the band, where it became the foundation of the song. He says there is no reliable way to summon that kind of inspiration: musicians can work at their craft, but “you never know when the magic’s going to strike”.
In short
- Iommi says “Symptom of the Universe” began with an unexpected riff.
- He brought the idea to Black Sabbath and built a song around it.
- He says inspiration cannot be predicted.
Explained simply
Black Sabbath are an English rock band formed in Birmingham in 1968. Guitarist Tony Iommi helped shape their heavy sound, which influenced the development of heavy metal.
A riff is a short musical phrase, often played on guitar, that can anchor a song. “Symptom of the Universe”, released in 1975, is known for its forceful guitar part and is often cited as an important metal track.
Iommi’s account describes how the riff began at home before he brought it to the band to build into a song. It offers a glimpse of songwriting as a mix of practice and inspiration, which can arrive unpredictably.