According to available information and how he was rehearsing the songs for his ‘This Is It’ shows, Michael Jackson planned to sing fully live the following songs:
- ‘Wanna Be Startin' Somethin’
- ‘Human Nature’
- ‘J5 Medley’
- ‘I Just Can't Stop Loving You’
- ‘Black Or White’
- ‘Beat It’
The rest of the songs were going to be either fully lip-synced, or partly live and partly lip-synced.
For example, ‘Thriller’, ‘Man In The Mirror’, ‘Jam’, ‘The Way You Make Me Feel’, ‘Heal The World’, ‘They Don't Care About Us’ were going to be fully lip-synced with his usual few, live ad-libs.
‘Earth Song’ was going to be partly live and partly lip-synced (the ‘what about…’ parts were going to be lip-synced because they were strenuous for his voice if he sang them live.
Remember, these ‘what about…’ parts were strenuous for his voice when he was recording the song for the ‘HIStory’ album, that is why he recorded these parts at the end of the album’s sessions.
Contrary to what Michael Durham Prince said about that, Michael Jackson generally in his career did not like using pre-recorded vocals during his shows which suggests that he was not going to use pre-recorded vocals also for the ‘This Is It’ shows.