I don't want any rappers in the album, that doesn't count as a collab to me.
Realistic collabs: NeYo because he worked on the album. Blake because Shakira said that she started to like country music. Usher because they once performed with Strevie Wonder and I think they both worked on a song that was never released.
Dream collabs: Justin Timberlake in a song that sounds like She Wolf and Sexy Back

Legend X in a spanish song

A rock ballad with Adam Levine
