Despite the fact that Michael Jackson and RedOne worked together for many hours on songs (in 2008-2009), the vast majority of the recorded material is unfinished.
Michael Jackson laid down his vocals on songs that RedOne describes as very good, energetic and uplifting.
“…The music we were doing was good, really good...very energetic, uplifting. It's sad that we never finished the material…” (RedOne)
However, RedOne did state that there is material (from those sessions) that can come out some time in the future, but he is only interested in releasing them for charity purposes.
Due to Michael Jackson’s unavailability at some point, RedOne recorded the last song (that he was supposed to record with Michael Jackson's voice) with Bruno Mars’ voice on it instead.
“…We started meeting up in his studio and you know after a while I started to get comfortable around him, it wasn’t until months later we were at his house in a studio and he went in to record the vocals and started singing that I realized again that Michael Jackson is in front of me, I got chills while listening to him singing… I recorded the last song I was supposed to work on with Michael with the voice of Bruno Mars because his voice sounds so similar to Michael’s…” (RedOne)
The RedOne recording sessions took place mainly in Las Vegas (2008-2009) and in Los Angeles (2009), and these songs were some of the very final songs that Michael Jackson generally recorded with his voice before his death.