Future’s 56 Nights mixtape remains a fan favorite; dropping between his tepidly-received sophomore album Honest and his smash-hit DS2 in 2015, 56 Nights (and its companion mixtape Beast Mode) helped the Atlanta rapper get his groove back.

All but one of the songs on the 10-track mixtape are produced by frequent Future collaborator Southside. What fans didn’t know, however, is that the Atlanta producer created all the beats for the mixtape in a single night. During a recent interview with Spotify’s original series Traffic Jams, he explained how every beat for the whole project came together in such a short amount of time.

T-Pain & Southside — Spotify Rapper T-PAIN and producer SOUTHSIDE, who've never worked together before, are thrown into the back seat of an SUV and sent into the middle of LA's legendary rush hour traffic where the pair have to create a brand new song, from scratch, before arriving at the Spotify-All Def Stage, where hundreds of fans are waiting to hear them perform that song...

“My boy Slug, one of my artists, he pulled up on me and was like ‘Bro you ai’t made me no beats in like six years,’” Southside said during the interview. “Fucked around and made him a cool nine beats, and my phone rings. It’s Future, like, ‘Yo I need some beats right now. I’m about to walk in the booth right now.’ I looked at Slug and I was like, ‘I can give you 10 more on top of those nine.’ He was like, ‘Send them.’ And that shit ended up being 56 Nights.”

The mixtape ended up being a huge success for Future, earning over 684,000 downloads and 2.5 million streams on DatPiff. The video for its biggest single, “March Madness,” has racked up 23 million YouTube views since its release in early 2016.

You can watch the interview above via Spotify and catch up on all the lyrics to Future’s 56 Nights on Genius now.