Nicki Minaj has previewed some new music and called on a number of artists, including Kehlani and Jhené Aiko, to collaborate with her.The rapper is currently recording new material, and previewed one track on social media on Tuesday night (September 7).Minaj called on her fans yesterday (September 8) to reach out to Keke Wyatt, Tamar Braxton and Brandy “to redo” the vocals from the song snippet, saying that she would “love to hear people who can really do it” before adding: “Once I have the a