He reached this notes after my upload of this video (His vocal range was A2 - F#7):
http://www.youtube.com/watch?v=ovLb_N_O4wM

And Today his range is A2 - B7 (5 octaves and 1 tone!!!)

You can find me on facebook: facebook.con/FunVocalRange
tags : Mitch Grassi Highest Notes EVER!,Pentatonix (Musical Group),Evolution of Music,NSYNC,Maclemore,Scott Hoying,Avi Kaplan,Vocal Range,Whistle Notes,Whistle Register,Countertenor (Musical Voice),Music (Industry),Best,Ever