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The 1975 use densely-layered vocal harmonies, often electronically augmented, as with a vocoder. The hypnotic effect is enhanced by droning on the 1st and/or 5th scale degrees alongside a moving topline melody.
This is moderately common in the '80s-inflected indie pop of the 2010s, recalling similarly drone-based vocals from Fleetwood Mac's Tango In The Night (1987).
The 1975 use a closely related technique on other instruments: playing a repeated high-octave 1̂-5̂ dyad over moving chords. Matty Healy calls these "synth stabs" and credits them to Prince's I Wanna Be Your Lover (Tape Notes Episode 18, 2019).
The 1̂-5̂ vocal drone can also be heard in many songs by MUNA, and to a lesser extent by HAIM and Carly Rae Jepsen.
These songs share
- A wordless staggered scalar descent that punctuates a section, in both cases using the notes E, D, C#, B, and A
- On VH1 Storytellers (2001), Simon Le Bon of Duran Duran told the audience he was "obsessed by" Gordon Lightfoot's If You Could Read My Mind when he was a child, and that it inspired two Duran Duran songs. In the Ask Katy online fan Q&A, he elaborated: "just the doo doos on Hungry Like the Wolf."

Swift has her own melodic signature [...]: a three-note melodic motif [usually descending from 4̂ to 3̂ and then to 6̂] that we've termed the "T Drop."
— Nate Sloan & Charlie Harding, Switched On Pop (2020), p. 22
It first appears in You Belong With Me (2008) and is a consistent feature of her writing since then.












