When Lorde first started curating "The Hunger Games: Mockingjay - Part 1" soundtrack, she thought she would just pick 15 artists to add to the album, but she later learned that it would be more complicated than that.

"Basically, I didn't realize how hard working with other artists was," Lorde said according to The Fader. . "I only have to deal with myself, and I know how bad I am at meeting time goals."

Lorde had her eye on Nicki Minaj, but it ended up not working out. The New Zealand pop star is disappointed -- but not entirely.

"Nicki was going to do a thing, which was going to be amazing, but she's obviously super-deep in her album, which is going to be awesome and even if I couldn't get a song I'm happy we're going to get a new Nicki Minaj album to listen to at the gym for six months," Lorde explained.

Lorde also said that many artists turned her down when she approached them with the project.

Putting together the album was also difficult for the singer because she had to make sure everyone got their music in a timely manner. Lorde explained that she hates being rushed when she is making music because it's as though someone is trying to "choreograph" her "creative process."

Lorde also put a lot of pressure on herself. Unlike her own music, Lorde worried about whether it would be well received. She didn't want to disappoint the fans of the movies, so she knew the music had to be perfect as well.

"I just had visions of the entirety of the fandom turning their backs on me and the album being number 400 on iTunes or something," she said. "I'm lucky enough that I never put pressure on myself making my own music, but with this I definitely felt the pressure of making it cool but also commercially viable."