Heat Waves

Heat Waves is a masterclass in doing more with less. The entire song is built on a single four-chord loop (I-V-vi-IV), one of the most ubiquitous progressions in pop music, yet it never feels stale. The magic lies in how Bayley layers the arrangement — the pitched-down vocal bass, shimmering guitar arpeggios, and 808 percussion create evolving sonic landscapes over the static harmony. The choice to stay in D major while delivering deeply melancholic lyrics produces a bittersweet tension that mirrors the song's theme of warm memories intertwined with grief. The harmonic simplicity is entirely intentional: it creates the hypnotic, wave-like quality the title promises.

Dave Bayley wrote 'Heat Waves' alone in the studio late at night, coming up with the chord progression while playing around on guitar. The lyrics poured out in just one hour, driven by the raw emotion of losing a close friend whose birthday fell in June. The line 'Sometimes all I think about is you / Late nights in the middle of June' is a direct reflection of that grief. In a memorable anecdote shared on the Song Exploder podcast, Bayley revealed that after finishing the song alone in the studio, he turned around to find Johnny Depp sitting behind him — Depp had been working in another studio in the building and became the first person to hear the track.

Glass Animals' 'Heat Waves' is the slow-burning sleeper hit that redefined viral success in the streaming era. Built on a mesmerizing four-chord loop layered with 808s, pitched-down vocals, and shimmering guitar, the song took a record-breaking 59 weeks to climb to number one on the Billboard Hot 100, becoming one of the most-streamed songs of all time with over 3 billion Spotify streams.