Article Summary: Recent studies have demonstrated that human infants are more cognitively adept that had been thought previously. These cognitive abilities enable infants to discriminate among objects and events in their environment. For example, at a very early point in their development human infants must sort out important noises in their environment for instance, they must learn to recognize speech. A study was done to find out whether 4 month-old infants were sensitive to disruptions in natural structure of music. The infants listened to short selections of simple Mozart minuets that were either natural (pauses corresponded to the phrases in the music) or unnatural(pauses inserted in to middle of phrases) A total of 24 month-old infants was tested. An infant sat on a parent’s lap inside a three-sided test booth. In the middle of the booth was green light and on each side was an audio speaker. An observer looked through a peephole in the center panel and recorded direction and duration of head turns. A test trial consisted of the child’s attention first being drawn to center light; then a red light above one of the music was played. When the child turned toward the loudspeaker, one of the two kinds of music was played. The observer measured the length of time the child remained oriented to speaker. Results revealed that children oriented significantly longer to the naturally segmented music that to the unnaturally children are sensitive to certain natural segmental acoustic cues; these cues may be similar to those the child uses to organize human speech