The Greatest Night in Pop (2024) is a documentary about making "We Are the World" in 1985. Harry Belafonte initiated the project in December of 1984 and it was recorded a month later between January 22 and 28 of 1985.
From Brian Tallerico at Roger Ebert:
After that kind-of-generic VH1 intro segment, when everyone gets to the studio, "The Greatest Night in Pop" lives up to its potential. There's tons of footage from the night and some great trivia, much of it shared by participants like Sheila E., Bruce Springsteen, Huey Lewis, and Smokey Robinson, who reveals how he talked Jackson out of some bad lyric changes because he was one of the people not scared to stand up to the King of Pop. From Richie's eating habits to Dylan's apprehension at the vocal range to changing lyrics in the moment, those who love music process docs will be enraptured. Music bio-docs may be running out of steam, but "The Greatest Night in Pop" works by being specific and enlightening.
Richard Roeper, The Chicago Sun-Times:
With Quincy Jones producing and a handwritten sign saying, "CHECK YOUR EGO AT THE DOOR," the 46-member super-group knocked out the song over the course of eight hours.
It's great fun to hear Dionne Warwick's honey-coated voice meshing with Willie Nelson's raw but still smooth vocals and to see how Wonder used his incredible mimicry skills to show Bob Dylan how Dylan could contribute his lines. [...]
Looking back all these years later, it's something of a miracle that, in the days before texts and emails, when you had to communicate by fax and messenger and landline phone calls, so many performers who were used to being the biggest star in the room agreed to get together on relatively short notice and figure out a path to record one of the most impactful singles in music history.
Lionel Ritchie and Michael Jackson wrote the tune in record time, but, as I've already said, the project was initiated by Harry Belafonte. Thus it was only fitting that in the middle of the recording session Al Jarreau starting singing "Banana Boat Song (Day O)," the 1956 hit that made Belafonte a star. Everyone joined in and sang along with him. For me, that was the hit of the evening, perhaps because I remember Belefonte from my childhood. When it came time for Bob Dylan to sing his solo part, they cleared the studio so he could do it without onlookers. This film has many such details.