Heart of Glass

Heart of Glass is a masterclass in 'New Wave Disco.' While its harmonic language is strictly diatonic E Major, its complexity arises from its rhythmic arrangement—specifically the famous 'hiccup' where the song briefly shifts into 7/4 time during the bridge. Harmonically, the song uses the relative minor (C#m) to undercut the bright disco aesthetic with a sense of emotional fragility, perfectly supporting the 'Heart of Glass' lyrical theme.

The song was originally written in 1974 or 1975 under the title 'The Disco Song.' It went through several iterations, including a slower funk version and a reggae-inspired version, before producer Mike Chapman suggested a more polished disco-oriented arrangement for the 'Parallel Lines' sessions.

Originally a reggae-tinged demo, 'Heart of Glass' transformed Blondie from underground favorites into global superstars by bridging the gap between New Wave and Disco. Produced by Mike Chapman, the track is a landmark of the late 70s, celebrated for its pioneering use of the Roland CR-78 drum machine and Debbie Harry’s ethereal vocals.