John Lennon and Yoko Ono's son reveals that he wrote the song with Fisher years ago.
Carrie Fisher had an array of talents, and it turns out, songwriting was one of them.
Over the weekend, Sean Lennon -- the son of the late John Lennon and Yoko Ono -- released a track titled "Bird Song" that he says he wrote years ago with the 60-year-old star, and he had Willow Smith sing with him. "When she died I just felt I had to record it," the 41-year-old musician described the song on Soundcloud. "This is only a demo unmixed, we only had a few hours to record it. But the lyrics she wrote with me I think are marvelous."
WATCH: Meryl Streep, Gwyneth Paltrow Among Those Mourning Carrie Fisher in Private Memorial Service
Lennon recalled of his late friend, "Carrie and I used to stay up 'til dawn chatting and pontificating about life. They were my best moments. Anyway... we wrote a song about staying up too late and hearing the birds sing."
As for Smith's singing on the track, he gushed, "Willow Smith is a prodigal angel and was generous enough to lend her golden voice to this little tune."
After Fisher's death on Dec. 27, Lennon paid tribute to her in an emotional, lengthy Instagram post. "I can honestly say that Carrie was one of the best and closest friends I've ever had in my life," he wrote. "She was the smartest, funniest, kindest, and most generous person I have ever known. My heart is completely and permanently broken."
"This is the kind of loss that you never recover from. I know because I still miss my dad every single day," he added. "Carrie, I love you so much. I can't imagine living my life without you there to fix it. You meant more to me than just friend or family, I feel that you were part of me, and you always will be. I can never thank you enough for all those magical evenings."
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In addition to Lennon, Fisher's family, friends, co-stars and peers shared heartfelt photos and messages on social media in remembrance of the Star Wars actress. Here's a look at some of those touching tributes:
