Nicki Minaj dropped out of appearing on 'The Hunger Games: Mockingjay - Part 1' soundtrack.

According to singer Lorde, who penned 'Yellow Flicker Beat' for the latest instalment of the movie franchise, the 'Anaconda' hitmaker was ''going to do a thing'' but struggled to find the time in between recording her new album.

Lorde told MTV: ''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.''

As a solo artist, Lorde, 18, also confessed she found it difficult collaborating with other singers and admitted she was surprised by the difficulties that came along with producing tracks.

She said: ''Basically, I didn't realise how hard working with other artists was. I only have to deal with myself and I know how bad I am at meeting time goals.

''It was kind of funny being on the other side of that being like, 'We have deadlines, we have budgets, we have different demographics to think about.'

''But most people adhered to the time really well and were really lovely about getting it done and I think they realised how much it meant to me, based on the intense vocab I used in my emails.''