We like to imagine that musical talent is just a matter of putting in enough hours. The Beatles became superstars because they spent years honing their craft in Hamburg, right? Well, maybe not. A recently published study from the Karolinska Institute's Miriam Mosing suggests that you need the right genes to become a true maestro. The research compared thousands of identical and fraternal twins to see whether lots of practice improves a person's ability to detect changes in melody, pitch and rhythm. Unfortunately, it didn't make a lick of difference for the identical twins; they had the same level of appreciation, regardless of how much time a given twin spent performing.