Black Sabbath - changes, 1972

"Changes" was not recorded with a real string ensemble. Instead, Geezer Butler and Tony Iommi used a Mellotron to create the sound of an orchestra. The ballad is generally an outlier in the band’s discography as it does not feature guitar or drums. To alleviate concerns about the band departing their well-known heavy sound, Osbourne promised in a 1972 interview "We're certainly not going to get any less heavy, we will probably do 'Changes' on stage with a Mellotron, but we'll never take strings on stage with us or anything like that."