In September of 1977, NASA’s Jet Propulsion Laboratory began the Voyager 1 mission. Still returning data, Voyager 1 is nearly 15 billion miles from Earth, deep into interstellar space. On board Voyager 1 is a Golden Record, containing greetings in 55 languages, pictures of people and places on Earth, and 27 diverse musical selections including Beethoven, a Raga from India, and a blues by Chuck Berry. The Golden Record announces the presence of a musical species in the cosmos. The record’s inscription reads: “To the makers of music, all worlds / all times.” On 31 November 2020, NASA scientists received an unexpected radio transmission. The signal contained assembly instructions for what appears to be a musical instrument. Apparently an alien intelligence has received the Golden Record, interpreted it, and responded in kind. Help NASA scientists decipher what the aliens are trying to share about music!