Session notes: how "bad guy" was built in a bedroom, from what Finneas has said in public

"bad guy" is one of the most cited examples of a hit made at home. The interesting part is not that it was made in a bedroom. It is how few decisions the song actually rests on, and how long the makers were willing to leave it unfinished. Everything below comes from what Finneas O'Connell has said in public, in an interview with Mix and on the Billboard Chart Beat podcast as written up by Hit Songs Deconstructed. Where he did not say something, we do not guess: he has not, in these sources, named the synth or sample behind the bass.

The room and the rig

Mix describes an ordinary bedroom, with Billie's vocals recorded there. Finneas called its sound "very tight and intimate and closed and quiet". The rig Mix lists is modest: Logic Pro X, a Universal Audio Apollo 8 interface, Yamaha HS5 monitors with an H8S subwoofer, an Audio-Technica AT2020 for the early vocals (later a Neumann TLM 103), and Spectrasonics Keyscape for pianos.

How the song came together

1. 2017, the seed. Finneas walked into Billie's room and heard the basics of a beat: in his words "the high hat, and the 808 kick drum" (Hit Songs Deconstructed).
2. The outro came first. Billie had recorded her own vocal for roughly the last forty seconds. Finneas says it was the first thing she produced, and that he liked how it was "distorting and clipping". They did not know what to do with it, so it waited.
3. Seven or eight months later, the bass. Messing around in his own room, Finneas played the kick and bass combination he calls "the whole root of the rest of the song".
4. Chords and harmony over the groove. He wrote the verse chords over the bass line and drums, which led to the three-part vocal harmony. In Mix he says the interesting thing about the song is not the verse melody but "three-part harmony and it's the rhythm".
5. Found sounds. The hi-hat-like sixteenth notes in the hook are, he says, "actually the crosswalk, 'go' sound in Australia", heard while touring there.
6. Recorded as it was written. "We were recording it the whole time we were writing it," he says. His estimate is about a week and a half of work spread over roughly a year.

Processing and handoff

The "rattlesnake" vocal came from Logic's stock Vocal Transformer, which Finneas told Mix is "really good at making a vocal sound crazy and unique". He also described a habit of harsh tremolo with smoothing at 0% and the rate on eighth or sixteenth notes. Mixing went to Rob Kinelski and mastering to John Greenham, but Finneas sends songs already compressed, panned and with reverbs and delays in place. He does not want the mix to fix anything, only to balance it, partly because his bedroom mixes come out with too much bass.

What we think a home producer can take from it

• Stock tools were enough for the signature moments. The most quoted vocal effect on the record is a plug-in that ships with Logic. Before buying anything, learn what is already in your DAW.
• Park ideas instead of forcing them. The outro sat for months and the bass arrived much later. A folder of unfinished fragments is not failure; on this song it was the method.
• Build around one strong rhythmic idea. Finneas's own account puts the bass groove and the rhythm of the harmonies at the centre, not a big melody. If your verse feels weak, try making the groove carry it.
• Commit while you produce. He hands off near-finished sessions. That only works if you make the effect and balance decisions yourself, at the time, instead of leaving them for "the mix".
• Know your room's lie. He admits his room exaggerates bass and plans for it. Every home setup has a bias; the useful skill is knowing which way yours leans.
• Record the world around you. A crosswalk signal became one of the most recognisable sounds in the song. A phone recorder is a sample library.

The caveat: one hit's story is not a recipe. Countless bedroom songs made the same way never get heard, and survivorship makes any single success look more deliberate than it was. What transfers is the workflow, not the outcome.