My theory is that Mariah Carey can sing anything. You hear that expression, 'She can sing the phone book’. If you can really sing, you should be able to sing anything. That's [what] the whole competition [is about].

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "My theory is that Mariah Carey can sing anything. You hear that expression, 'She can sing the phone book’. If you can really sing, you should be able to sing anything. That's [what] the whole competition [is about]." in the context of "American Idol judge Randy Jackson" to mean that wisdom is timeless.