When you shine light on molecules, they resonate at certain special frequencies, just as a tuning fork resonates with sound waves. Calculating these resonant frequencies seems like a daunting task, usually requiring the full machinery of quantum mechanics, but in this class we'll explore a simpler way. By thinking about the shape of a molecule, we can understand its resonances using pictures, visual intuition, and a minimum of math. Come see how chemists use symmetry to study the hidden music of molecular vibrations.