When you are developing your vocal skills you will add more and more vocal techniques to your singing.
Not all singers use the same advanced techniques. It all depends on your repertoire, your style and your voice type.
In this video, Kristin Chenoweth invites a fan to sing a duet on stage. This fan turns out to be voice teacher Sarah Horn. Sarah has trained her voice very well and sings with The sum of vocal techniques. Enjoy!