J. Cole’s 4 Your Eyez Only dropped in December 2016, more than three years after his sophomore album Born Sinner. During his tour stop in Anaheim, Calif. on Sunday, Cole revealed a unique connection between two popular songs on the projects.

During his set, Cole transitioned the end of “Forbidden Fruit” (from Born Sinner) into the intro of “Neighbors” (from 4 Your Eyez Only) singing: “I guess the neighbors think I’m sellin' dope.“ As the first song trailed off, Cole reversed the track’s instrumental into “Neighbors” to show that the beat is the same. This technique could be considered a form of “backmasking,” in which a sound is recorded backwards onto a track. Artists like Missy Elliott have used backmasking as a way to add layers to their music. While the two tracks sound radically different because of unique engineering and production, they ultimately use the same instrumental.

“Neighbors” tells the story of when J. Cole’s house in Fayetteville, N.C. was raided by a SWAT team searching for narcotics. It’s produced by J. Cole and engineered by Juro “Mez” Davis, who worked on the entirety of 2014 Forest Hills Drive and—not coincidentally—mixed “Forbidden Fruit."

“Forbidden Fruit" featuring Kendrick Lamar appears on Cole’s sophomore album Born Sinner. It samples “Mystic Brew” by funk instrumentalist Ronnie Foster. A Tribe Called Quest sampled the same song on on 1993’s “Electric Relaxation.”

Read all the lyrics to J. Cole’s 4 Your Eyez Only on Genius.