Serotonin is the first song off of girl in red’s debut album, if i could make it go quiet. Marie grapples with depressive episodes and her struggle with mental health, a common theme across her songs.

In an interview with Spotify, she notes her new style and experimenting with rapping:

The first song on the album, “Serotonin,” which is also a single out today, includes a collaboration with producer FINNEAS where you’ll be rapping. What was experimenting with this style like? Do you see yourself doing more of it?

I think so, because I thought it was really fun. That rapping thing was all coming from me. No one was like “Yo Marie, what if you try rapping, what if you, like, get on those trap beats?” So I definitely think I want to go a little bit into that direction, but in my own way. Like Ed Sheeran, he raps but like it’s still Ed Sheerhan [sic], you know what I mean?

This marks her first collaboration with producer and singer-songwriter FINNEAS.