At 16 weeks old, the fetus becomes aware of sound as vibration. Studies have shown that exposing a fetus to classical music makes them calmer, happier and potentially smarter babies. Classical music works on the whole brain while other types of music such as country and pop work only 1 side of the brain. A French scientist named Rauscher popularized a theory known as The Mozart Effect. His studies show that after exposing volunteers to Mozart’s sonatas for 10 minutes, the subjects showed a marked increase in their spatial reasoning abilities. So can Mozart make you smarter? Well, several animal studies have exposed rats to white noise, Mozart’s music, and other composers. The rats who listened to Mozart’s music completed a complex maze with significant speed and fewer errors than the other control groups. For more information, check out Don Campbell’s book The Mozart Effect.