Photo: Marin Leong Back in 2018, Lucy Dacus started playing a song in her live sets called “Thumbs.” It quickly became a fan favorite. Dacus had asked fans to not record the song during performances so it could be enjoyed once it was eventually released as a single, but she inadvertently caused a mythologization of the song. There’s even a fan-made Twitter account dedicated to “Thumbs,” tracking whether it was released or not. She first surprised 100 random fans with a hand-assembled VHS tape featuring “Thumbs” in late February. Now, the singer-songwriter has finally decided it’s time to share “Thumbs” with the world.