David Gilmour has released “Yes, I Have Ghosts,” the Pink Floyd guitarist’s first new music in five years. The song is a collaboration with his daughter, harpist Romany Gilmour, and his wife, the author and lyricist Polly Samson. The song was previously part of the audiobook version of Samson’s latest novel, A Theatre for Dreamers. Prior to the spread of COVID-19, the trio was planning to promote the book during a “series of shows blending words and music.”