Play a note, any note — on your piano, your harp, your synthesizer, your kazoo. University of Delaware junior David Krall can tell you exactly which note you’re playing and which octave it lives in.

Both light and sound travel as waves, with characteristics that allow people with typical vision and hearing to perceive and categorize them when they reach their eyes and ears: “That’s a small red ...

Mariah Carey, Ella Fitzgerald, Bing Crosby, Mozart, Beethoven, Jimi Hendrix, and Yanni. What do these musicians have in common? They’re all said to have perfect pitch. Perfect pitch (technically known ...