He also revealed that the first project took over a year-and-a-half to finish.

After a few ups-and-downs in their relationship, Kid Cudi mended fences with his mentor Kanye West in 2016. The reconciliation resulted in their joint project Kids See Ghosts, which is widely regarded as a highlight of the recent five-week run of G.O.O.D. Music releases. In a new interview with Billboard, Cudi revealed that the duo plans to continue collaborating in the future.

While Kids See Ghosts was always planned to be seven songs, Cudi said that there’s leftover material from the recording sessions which could be released later on. “There are some songs that we didn’t use that I’m hopeful we can put out later. But the plan is to do more Kids See Ghosts albums,” he said.

Cudi also shed some light on the making of the album to dispel rumors that it was put together last minute. He stated that although he and Kanye have undeniable chemistry, it took over a year-and-a-half to “get it tight and where we wanted it to be.” The actual process of songwriting wasn’t difficult, but it took months of “chiseling away at it” to get to the final product.

One song Cudi spoke about in particular is “Reborn,” which he described as a continuation from his previous work. “It hasn’t been said that I’m good, that I’m OK,” he explained. “On Passion, Pain [& Demon Slayin'], I never let the world know that I’m good, because I wasn’t good yet… It was great when Kanye wanted to use [the song], because it was perfect for both [of us]—we are both reborn after what we went through.”

Elsewhere in the interview, Cudi touched on the extensive use of samples on the album. Although he was most worried about clearing Kurt Cobain’s posthumous song “Burn the Rain” on the closing track “Cudi Montage,” it turns out that the late Nirvana frontman’s wife Courtney Love and daughter Frances Bean Cobain didn’t stand in the way.

“Courtney told me, ‘I don’t clear shit for just anybody,’ and I was like, ‘I know, I know,’ and I was so thankful,” Cudi said. “Those songs took some real time and real work.”

Genius previously broke down all the samples from Kids See Ghosts:

Read the full interview at Billboard and read all the lyrics to Kid Cudi and Kanye West’s Kids See Ghosts on Genius now.