Among her many hidden talents, Carrie Fisher was a delightful singer, though she rarely showed off her voice. With that in mind, here’s a musical collaboration you probably never saw coming: Sean Lennon and Willow Smith have made a haunting duet co-written by none other than Fisher. According to Lennon, he and Fisher wrote “Bird Song†together “years ago†— Fisher was a longtime friend of the family and even once performed a Yoko cover with the Plastic Ono Band — but was inspired by her death last year to finally record it. “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. Willow Smith is a prodigal angel and was generous enough to lend her golden voice to this little tune,†he writes. (Willow’s also been known to cover Sean.) After Fisher died, Lennon called her “one of the best and closest friends I’ve ever had in my life†and described her death as “the kind of loss that you never recover from,†comparing its personal emotional impact to that of his father John Lennon’s death.