📜 An unusual pair of musical instruments by Christopher Janney, hidden in plain sight on Manhattan subway tunnels. 🔍 Located on N/R train platforms, they sing to each other.# Why Go🎶 Interactive sound experience🤫 Discover a secret city joy🚇 Unique subway art installation🎵 Sounds updated annually# Why Avoid💤 Easily missed if you don't know where to look# Tips🐦 Sounds are bird calls as of January 2020.