Last night I dreamed of a piano with a broken string that sounded like a songbird

I was tuning a grand piano in a room with no windows, and one of the midrange strings had snapped — but instead of silence, it kept humming a note that changed pitch all on its own, like a bird learning a song. I tried to fix it, but every time I touched the string it would fly away and land somewhere else on the piano. Woke up with my fingers aching.