Music affects how we perceive facial expressions

Music can be thought of as a form of emotional communication, with which the performer conveys an emotional state to the listener. This "language" is remarkably powerful - it can evoke strong emotions, and make your heart race or send tingles down your spine. And it is universal - the emotional content of a piece of music can be understood by anyone, regardless of cultural background.

Are the emotions evoked by piece of music similar to, and can they influence, other emotional experiences? The answer to these questions is unclear. But a new study, which has just been published in Neuroscience Letters, provides both behavioural and physiological evidence that the emotions evoked by music can be transferred to the sense of vision, and can influence how the emotions in facial expressions are perceived.
(via NYTimes science section)