Mariah Carey is considered one of the best modern singers in music industry. She is admired basically because of some of her techniques, mainly the "whistle".

I must say as an intimate comment about this technique that, from my point of view, you most posses a pretty specific type of voice, maybe certain physiological characteristics. I've studied this technique and even when it doesn't sound as heard from Mariah, it can be pretty useful to create subtle shades on your approach... Practicing a new technique is always going to give us the result of learning more about our voice, its particularities,... I guess I'm making such introduction because of the compromise I feel into considering your possible expectations of me singing Mariah's (LOL).