While doing research for my project I've been reading about the "Mozart effect," which influenced the Baby Mozart videos as well as the whole classical music for kids fad. It even went as far as being used to pass laws in some states that required childcare centers to play classical music. It turns out this effect has basically become an urban legend. The original research was done on college students, and only helped them with certain kinds of tasks for about 10 minutes after listening to the music. Also, other studies done on the effect did not always get the same results.
Although research was never done on the effect in babies and children, many people came to believe that classical music could increase their babies' intelligence. This article describes how the effect was exaggerated and overgeneralized. It also introduces the opinion that the spread may be related to Americans' fears about education and knowledge.
One of my sources for the group project suggests that while listening to music may not increase children's intelligence, learning how to create music may have positive cognitive effects. This situation relates to what we did in class last week, when we reviewed each other's sources. It is important to do research even on our research, and not to extend a scientific finding to an area where it has not been tested.
Also, this site has some research on how music and music learning affects people cognitively and some studies related to the Mozart effect.