Paul McCartney, Meryl Streep, Dave Chappelle, more appear in inspiring "Dream Still Lives" video
Oscar-nominated songwriter Diane Warren penned all-star track, "This Is for My Girls" that also includes Lea Michele, Janelle Monae and Kelly Rowland
Singer performs "(You Make Me Feel Like) A Natural Woman" during ceremony's Carole King tribute
Obama: "He is a jackass. But he's talented."
Former U.S. presidents Barack Obama, Bill Clinton, George Bush, and Donald Trump were among those to share their condolences