Simplify the following text for a Grade 11 native English-speaking person.
Original: Bell began taking violin lessons at the age of four after his mother discovered her son had taken rubber bands from around the house and stretched them across the handles of his dresser drawer to pluck out music he had heard her play on the piano .
Simplified: He began violin lessons at the age of four after his mother found that her son had taken rubber bands from around the house and stretched them across the handles of his dresser drawer to pluck out music he had heard her play on the piano .