Listening to Mozart's music can improve IQ, which is called the "Mozart effect". Whether or not the "Mozart effect" has such magical effects, the role of music in shaping sentiment and soothing the mind is gradually emerging. It is also obvious that humans cannot do without music fact. Can we know from this passage? ['The author agrees with the "Mozart effect".', 'The author believes that music can improve IQ.', 'Can\'t see if the author agrees with the "Mozart effect".', 'Music plays a key role in brain development.']