Carrie's brother and Debbie's son, Todd Fisher, introduced the new tune on stage, which he said was "written for us."
"There’s still a light on your table. There’s still your name on my phone. I can’t believe I’m not able to call. We met in a beautiful place," the song began. "You danced, I talked. I go back there every single day. I’m still there, but you’re not."
"You lit me up and you led me inside. Then you disappeared with no warning sign. You broke more than my heart when you left without saying goodbye," the song continued. "I'm here to let you know. I'm here to let you go."
Todd revealed to ET on Wednesday that Blunt had written a "special" song for the memorial.
"It is quite special," he shared, adding that Blunt became fast friends with Carrie, and wrote "You're Beautiful" in her bathroom. "I actually think it is one of his best songs."
"The last lyric in the song, it's a beautiful song, is, 'I'm here to let you know. I'm here to let you go.' And it's powerful," Todd revealed. "The simplicity of his songs is pretty amazing. It's not like its [got] complicated lyrics but something about how he strings all this together is beautiful."
"I believe this song is going to be a really big song, not because of what it is, but because it is a beautiful standalone song, and I think it's going to mean a lot to a lot of people who have lost loved ones," Todd said. "It is truly a gift to all of us for all of us that have lost loved ones… Everybody has lost somebody and this song is a true help in letting go."