Watch Jay-Z and Justin Timberlake Sing a Moving Tribute to Trayvon Martin (VIDEO)

This weekend, despite the relentless heat, thousands continued to protest the shooting death of Trayvon Martin, and the acquittal of the man who killed him, George Zimmerman.

On Friday, Jay-Z joined Justin Timberlake onstage at their Legends of the Summer Tour to close out the show with a moving tribute dedicated to Martin. The video is blurry, but the audio is clear enough to hear the music, including the audience, who sang along.

President Obama spoke publicly about the case on Friday, saying, "Trayvon Martin could have been me 35 years ago."

The president recounted his own experience being black in America, discussing what it felt like to be followed in department stores and hear car doors lock as he passed by them.

The experience of being racially profiled was echoed across U.S. cities this weekend as demonstrators of all backgrounds showed up to declare they've had enough. Below are some of the most moving images from those protests.

(Photo: Scott Olsen/Getty Images)

(Photo: David McNew/Reuters)

(Photo: Carlo Allegri/Reuters)

(Photo: Andrew Innerarity/Reuters)

(Photo: Scott Olsen/Getty Images)

(Photo: Kevork Djansezian/Getty Images)

(Photo: David McNew/Reuters)

A 6 year old's sign + other moving photos from Trayvon Martin rallies in 100 cities: http://t.co/3Yek8qKisZ pic.twitter.com/6LquJQEz1a

— ThinkProgress (@thinkprogress) July 21, 2013

A powerful image from the Trayvon Martin rally in Atlanta today. More here: http://t.co/3Yek8qKisZ #icymi pic.twitter.com/qbniLxHeAp

— ThinkProgress (@thinkprogress) July 20, 2013

Only in America, where #Trayvon is guilty of his own murder. #JusticeForTrayvon #UniteBlue http://t.co/XVqEqeKlCS pic.twitter.com/DSk3PQiSNB

— KHARY PENEBAKER (@kharyp) July 20, 2013

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