After Jackson 's death , his brothers found Jackson 's demo version and added their voices and multiple instruments into the background .
In 1983 Jackson recorded a demo version of the song , which he had co-written with Paul Anka .
After Jackson 's death , Jackson 's brothers Jackson Jackson 's demo version and added their voices and multiple instruments into the background .
In 1983 Jackson recorded a demo version of the song , which he had co-written with Paul Anka .