Who is Justin Bieber's secret ingredient, according to his manager Scooter?

Explanation

After Usher started working with Justin, Usher got him involved with his singing teacher Jan Smith, also known as ”Mama Jan”. Mama Jan only works with the really big stars, and Justin describes her as one of the most important people in his life. When Justin hit puberty and his voice broke, Mama Jan helped him through this phase. Justin's manager Scooter calls Mama Jan Justin's secret ingredient.