The Walt Disney Company is being sued by the Michael Jackson Estate over a documentary that includes footage of his two children, plus short clips of two of his songs. Disney claims it did not need permission because it is a documentary, according to TMZ in "Michael Jackson Estate Sues The Walt Disney Co. You've Got Balls For Exploiting MJ's Kids!!"
The estate does have a duty to protect any copyrights entrusted to it, but is has filed many lawsuits over the years and remains in litigation. As a general rule, if someone were to make a movie and use an entire Michael Jackson song in it, then the estate would need to file a lawsuit if the song had been used without permission. However, in this case the estate might be a little overzealous.
Copyright does allow for the use of material without permission if that use falls under the fair use doctrine. Doctrine normally does allow for short clips of material to be used and more material can be used if it is done for educational purposes.
Reference: TMZ (May 30, 2018) "Michael Jackson Estate Sues The Walt Disney Co. You've Got Balls For Exploiting MJ's Kids!!"